diff --git a/src/Main/Base/Project/Src/Internal/ConditionEvaluators/WriteableProjectEvaluator.cs b/src/Main/Base/Project/Src/Internal/ConditionEvaluators/WriteableProjectEvaluator.cs
index 4c5b502baf..225f32321b 100644
--- a/src/Main/Base/Project/Src/Internal/ConditionEvaluators/WriteableProjectEvaluator.cs
+++ b/src/Main/Base/Project/Src/Internal/ConditionEvaluators/WriteableProjectEvaluator.cs
@@ -20,7 +20,7 @@ namespace ICSharpCode.SharpDevelop
 		public bool IsValid(object caller, Condition condition)
 		{
 			IProject project = (caller as IProject) ?? ProjectService.CurrentProject;
-			return !project.ReadOnly;
+			return project != null && !project.ReadOnly;
 		}
 	}
 }