java.lang.StringIndexOutOfBoundsException: String index out of range: -1
   at java.lang.String.substring(String.java:1871)
   at org.netbeans.modules.php.editor.model.impl.VariousUtils.getRelativesToUses(VariousUtils.java:1350)
   at org.netbeans.modules.php.editor.model.impl.VariousUtils.getRelatives(VariousUtils.java:1368)
   at org.netbeans.modules.php.editor.model.impl.VariousUtils.getAllNames(VariousUtils.java:1336)
   at org.netbeans.modules.php.editor.model.impl.VariousUtils.getPreferredName(VariousUtils.java:1322)
   at org.netbeans.modules.php.editor.PHPCompletionItem.getInsertPrefix(PHPCompletionItem.java:327)
   at org.netbeans.modules.csl.editor.completion.GsfCompletionItem$DelegatedItem.getInsertPrefix(GsfCompletionItem.java:207)
   at org.netbeans.modules.csl.editor.completion.GsfCompletionProvider$JavaCompletionQuery.getFilteredData(GsfCompletionProvider.java:657)
   at org.netbeans.modules.csl.editor.completion.GsfCompletionProvider$JavaCompletionQuery.filter(GsfCompletionProvider.java:413)
   at org.netbeans.spi.editor.completion.support.AsyncCompletionTask.refreshImpl(AsyncCompletionTask.java:198)
   at org.netbeans.spi.editor.completion.support.AsyncCompletionTask$1.run(AsyncCompletionTask.java:236)
   at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:251)
   at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:727)
   at java.awt.EventQueue.access$200(EventQueue.java:103)
   at java.awt.EventQueue$3.run(EventQueue.java:688)
   at java.awt.EventQueue$3.run(EventQueue.java:686)
   at java.security.AccessController.doPrivileged(AccessController.java:0)
   at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
   at java.awt.EventQueue.dispatchEvent(EventQueue.java:697)
   at org.netbeans.core.TimableEventQueue.dispatchEvent(TimableEventQueue.java:159)
   at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:242)
   at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:161)
   at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:150)
   at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:146)
   at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:138)
   at java.awt.EventDispatchThread.run(EventDispatchThread.java:91)