java.util.ConcurrentModificationException
   at java.util.LinkedList$ListItr.checkForComodification(LinkedList.java:761)
   at java.util.LinkedList$ListItr.next(LinkedList.java:696)
   at java.util.Collections$UnmodifiableCollection$1.next(Collections.java:1010)
   at org.netbeans.modules.php.editor.model.impl.ModelVisitor.findConditionalStatement(ModelVisitor.java:1143)
   at org.netbeans.modules.php.editor.model.impl.ModelVisitor.visit(ModelVisitor.java:739)
   at org.netbeans.modules.php.editor.parser.astnodes.Assignment.accept(Assignment.java:123)
   at org.netbeans.modules.php.editor.parser.astnodes.visitors.DefaultVisitor.scan(DefaultVisitor.java:54)
   at org.netbeans.modules.php.editor.model.impl.ModelVisitor.scan(ModelVisitor.java:114)
   at org.netbeans.modules.php.editor.parser.astnodes.visitors.DefaultVisitor.visit(DefaultVisitor.java:190)
   at org.netbeans.modules.php.editor.parser.astnodes.visitors.DefaultTreePathVisitor.visit(DefaultTreePathVisitor.java:207)
   at org.netbeans.modules.php.editor.parser.astnodes.ExpressionStatement.accept(ExpressionStatement.java:74)
   at org.netbeans.modules.php.editor.parser.astnodes.visitors.DefaultVisitor.scan(DefaultVisitor.java:54)
   at org.netbeans.modules.php.editor.model.impl.ModelVisitor.scan(ModelVisitor.java:114)
   at org.netbeans.modules.php.editor.parser.astnodes.visitors.DefaultVisitor.scan(DefaultVisitor.java:61)
   at org.netbeans.modules.php.editor.parser.astnodes.visitors.DefaultVisitor.visit(DefaultVisitor.java:100)
   at org.netbeans.modules.php.editor.parser.astnodes.visitors.DefaultTreePathVisitor.visit(DefaultTreePathVisitor.java:127)
   at org.netbeans.modules.php.editor.parser.astnodes.Block.accept(Block.java:96)
   at org.netbeans.modules.php.editor.parser.astnodes.visitors.DefaultVisitor.scan(DefaultVisitor.java:54)
   at org.netbeans.modules.php.editor.model.impl.ModelVisitor.scan(ModelVisitor.java:114)
   at org.netbeans.modules.php.editor.parser.astnodes.visitors.DefaultVisitor.visit(DefaultVisitor.java:257)
   at org.netbeans.modules.php.editor.parser.astnodes.visitors.DefaultTreePathVisitor.visit(DefaultTreePathVisitor.java:262)
   at org.netbeans.modules.php.editor.parser.astnodes.IfStatement.accept(IfStatement.java:108)
   at org.netbeans.modules.php.editor.parser.astnodes.visitors.DefaultVisitor.scan(DefaultVisitor.java:54)
   at org.netbeans.modules.php.editor.model.impl.ModelVisitor.scan(ModelVisitor.java:114)
   at org.netbeans.modules.php.editor.parser.astnodes.visitors.DefaultVisitor.scan(DefaultVisitor.java:61)
   at org.netbeans.modules.php.editor.parser.astnodes.visitors.DefaultVisitor.visit(DefaultVisitor.java:100)
   at org.netbeans.modules.php.editor.parser.astnodes.visitors.DefaultTreePathVisitor.visit(DefaultTreePathVisitor.java:127)
   at org.netbeans.modules.php.editor.parser.astnodes.Block.accept(Block.java:96)
   at org.netbeans.modules.php.editor.parser.astnodes.visitors.DefaultVisitor.scan(DefaultVisitor.java:54)
   at org.netbeans.modules.php.editor.model.impl.ModelVisitor.scan(ModelVisitor.java:114)
   at org.netbeans.modules.php.editor.parser.astnodes.visitors.DefaultVisitor.visit(DefaultVisitor.java:257)
   at org.netbeans.modules.php.editor.parser.astnodes.visitors.DefaultTreePathVisitor.visit(DefaultTreePathVisitor.java:262)
   at org.netbeans.modules.php.editor.parser.astnodes.IfStatement.accept(IfStatement.java:108)
   at org.netbeans.modules.php.editor.parser.astnodes.visitors.DefaultVisitor.scan(DefaultVisitor.java:54)
   at org.netbeans.modules.php.editor.model.impl.ModelVisitor.scan(ModelVisitor.java:114)
   at org.netbeans.modules.php.editor.parser.astnodes.visitors.DefaultVisitor.scan(DefaultVisitor.java:61)
   at org.netbeans.modules.php.editor.parser.astnodes.visitors.DefaultVisitor.visit(DefaultVisitor.java:100)
   at org.netbeans.modules.php.editor.parser.astnodes.visitors.DefaultTreePathVisitor.visit(DefaultTreePathVisitor.java:127)
   at org.netbeans.modules.php.editor.parser.astnodes.Block.accept(Block.java:96)
   at org.netbeans.modules.php.editor.parser.astnodes.visitors.DefaultVisitor.scan(DefaultVisitor.java:54)
   at org.netbeans.modules.php.editor.model.impl.ModelVisitor.scan(ModelVisitor.java:114)
   at org.netbeans.modules.php.editor.model.impl.ModelVisitor.visit(ModelVisitor.java:422)
   at org.netbeans.modules.php.editor.parser.astnodes.MethodDeclaration.accept(MethodDeclaration.java:77)
   at org.netbeans.modules.php.editor.parser.astnodes.visitors.DefaultVisitor.scan(DefaultVisitor.java:54)
   at org.netbeans.modules.php.editor.model.impl.ModelVisitor.scan(ModelVisitor.java:114)
   at org.netbeans.modules.php.editor.model.impl.ModelVisitor.scanNoLazy(ModelVisitor.java:1405)
   at org.netbeans.modules.php.editor.model.impl.MethodScopeImpl.scan(MethodScopeImpl.java:268)
   at org.netbeans.modules.php.editor.model.impl.MethodScopeImpl.getDeclaredVariables(MethodScopeImpl.java:116)
   at org.netbeans.modules.php.editor.PHPCompletionItem$ExistingVariableResolver.getDeclaredVariables(PHPCompletionItem.java:452)
   at org.netbeans.modules.php.editor.PHPCompletionItem$ExistingVariableResolver.access$100(PHPCompletionItem.java:386)
   at org.netbeans.modules.php.editor.PHPCompletionItem$ExistingVariableResolver$1.call(PHPCompletionItem.java:405)
   at org.netbeans.modules.php.editor.PHPCompletionItem$ExistingVariableResolver$1.call(PHPCompletionItem.java:401)
   at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
   at java.util.concurrent.FutureTask.run(FutureTask.java:138)
   at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1452)
   at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:2032)
Caused: java.util.concurrent.ExecutionException: java.util.ConcurrentModificationException
   at java.util.concurrent.FutureTask$Sync.innerGet(FutureTask.java:232)
   at java.util.concurrent.FutureTask.get(FutureTask.java:91)
   at org.netbeans.modules.php.editor.PHPCompletionItem$ExistingVariableResolver.resolveVariable(PHPCompletionItem.java:433)
   at org.netbeans.modules.php.editor.PHPCompletionItem$FunctionElementItem.getInsertParams(PHPCompletionItem.java:624)
   at org.netbeans.modules.php.editor.PHPCompletionItem$MethodElementItem.getInsertParams(PHPCompletionItem.java:368)
   at org.netbeans.modules.php.editor.PHPCompletionItem$FunctionElementItem.getCustomInsertTemplate(PHPCompletionItem.java:573)
   at org.netbeans.modules.php.editor.PHPCompletionItem$MethodElementItem.getCustomInsertTemplate(PHPCompletionItem.java:368)
   at org.netbeans.modules.csl.editor.completion.GsfCompletionItem$DelegatedItem.defaultSubstituteText(GsfCompletionItem.java:339)
   at org.netbeans.modules.csl.editor.completion.GsfCompletionItem$DelegatedItem.substituteText(GsfCompletionItem.java:329)
   at org.netbeans.modules.csl.editor.completion.GsfCompletionItem.defaultAction(GsfCompletionItem.java:479)
   at org.netbeans.modules.csl.editor.completion.GsfCompletionItem$DelegatedItem.defaultAction(GsfCompletionItem.java:118)
   at org.netbeans.modules.editor.completion.CompletionImpl.dispatchKeyEvent(CompletionImpl.java:652)
   at org.netbeans.modules.editor.completion.CompletionImpl.keyPressed(CompletionImpl.java:381)
   at java.awt.AWTEventMulticaster.keyPressed(AWTEventMulticaster.java:233)
   at java.awt.AWTEventMulticaster.keyPressed(AWTEventMulticaster.java:232)
   at java.awt.Component.processKeyEvent(Component.java:6333)
   at javax.swing.JComponent.processKeyEvent(JComponent.java:2801)
   at java.awt.Component.processEvent(Component.java:6152)
   at java.awt.Container.processEvent(Container.java:2083)
   at java.awt.Component.dispatchEventImpl(Component.java:4737)
   at java.awt.Container.dispatchEventImpl(Container.java:2141)
   at java.awt.Component.dispatchEvent(Component.java:4565)
   at java.awt.KeyboardFocusManager.redispatchEvent(KeyboardFocusManager.java:1836)
   at java.awt.DefaultKeyboardFocusManager.dispatchKeyEvent(DefaultKeyboardFocusManager.java:712)
   at java.awt.DefaultKeyboardFocusManager.preDispatchKeyEvent(DefaultKeyboardFocusManager.java:990)
   at java.awt.DefaultKeyboardFocusManager.typeAheadAssertions(DefaultKeyboardFocusManager.java:855)
   at java.awt.DefaultKeyboardFocusManager.dispatchEvent(DefaultKeyboardFocusManager.java:676)
   at java.awt.Component.dispatchEventImpl(Component.java:4609)
   at java.awt.Container.dispatchEventImpl(Container.java:2141)
   at java.awt.Window.dispatchEventImpl(Window.java:2482)
   at java.awt.Component.dispatchEvent(Component.java:4565)
   at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:684)
   at java.awt.EventQueue.access$000(EventQueue.java:85)
   at java.awt.EventQueue$1.run(EventQueue.java:643)
   at java.awt.EventQueue$1.run(EventQueue.java:641)
   at java.security.AccessController.doPrivileged(AccessController.java:0)
   at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:87)
   at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:98)
   at java.awt.EventQueue$2.run(EventQueue.java:657)
   at java.awt.EventQueue$2.run(EventQueue.java:655)
   at java.security.AccessController.doPrivileged(AccessController.java:0)
   at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:87)
   at java.awt.EventQueue.dispatchEvent(EventQueue.java:654)
   at org.netbeans.core.TimableEventQueue.dispatchEvent(TimableEventQueue.java:158)
   at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:296)
   at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:211)
   at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:201)
   at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:196)
   at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:188)
   at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)