@@ -83,7 +83,7 @@ protected IModelProvider getCachedModelProvider(IProject project) {
 	protected AbstractGroupProvider getCachedContentProvider(IProject project) {
 		AbstractGroupProvider provider = groupContentProviders.get(project);
 		if (provider == null){
-			if (project == null || !project.isAccessible()){
+			if (project == null || !project.isAccessible() || !project.isSynchronized(IResource.DEPTH_INFINITE)){
 				return null;
 			}
 			// if the project is no longer a valid flexible project (due to deletion of critical files)
Original file line number	Diff line number	Diff line change
`@@ -83,7 +83,7 @@ protected IModelProvider getCachedModelProvider(IProject project) {`
`83`	`83`	`protected AbstractGroupProvider getCachedContentProvider(IProject project) {`
`84`	`84`	`AbstractGroupProvider provider = groupContentProviders.get(project);`
`85`	`85`	`if (provider == null){`
`86`		`- if (project == null \|\| !project.isAccessible()){`
	`86`	`+ if (project == null \|\| !project.isAccessible() \|\| !project.isSynchronized(IResource.DEPTH_INFINITE)){`
`87`	`87`	`return null;`
`88`	`88`	`}`
`89`	`89`	`// if the project is no longer a valid flexible project (due to deletion of critical files)`