From 80819b3de72451bf3dfed81f9c6d96133d5b17a3 Mon Sep 17 00:00:00 2001
From: David Schulz <david.schulz@digia.com>
Date: Tue, 12 Nov 2013 13:33:01 +0100
Subject: [PATCH] GLSLEditor: Fix crash when GLSL highligher is used inside
 diff editor.

Task-number: QTCREATORBUG-10671

Change-Id: Ife5b1a5f2ec42ddaa1e1bc4ac1a953f34efd0d1a
Reviewed-by: Nikolai Kosjar <nikolai.kosjar@digia.com>
---
 src/plugins/glsleditor/glslhighlighter.cpp | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/src/plugins/glsleditor/glslhighlighter.cpp b/src/plugins/glsleditor/glslhighlighter.cpp
index ae64cd24faa..a298a38baa3 100644
--- a/src/plugins/glsleditor/glslhighlighter.cpp
+++ b/src/plugins/glsleditor/glslhighlighter.cpp
@@ -92,8 +92,9 @@ void Highlighter::highlightBlock(const QString &text)
     lex.setState(state);
     lex.setScanKeywords(false);
     lex.setScanComments(true);
-    const int variant =
-        GLSLTextEditorWidget::languageVariant(static_cast<BaseTextDocument*>(parent())->mimeType());
+    const int variant = GLSLTextEditorWidget::languageVariant(parent()
+                         ? static_cast<BaseTextDocument*>(parent())->mimeType()
+                         : QString());
     lex.setVariant(variant);
 
     int initialState = state;