--- a/project.ant/src/org/netbeans/spi/project/support/ant/AntProjectHelper.java	Fri Sep 17 20:36:27 2010 +0400
+++ a/project.ant/src/org/netbeans/spi/project/support/ant/AntProjectHelper.java	Fri Sep 17 20:38:33 2010 +0400
@@ -641,6 +641,9 @@ 
                         throw e;
                     }
                 }
+                if (pendingHookCount == 0) {
+                    pendingHook = null;
+                }
             }
         } finally {
             // #57791: release locks outside synchronized block.