1 files changed, 4 insertions, 1 deletions
diff --git a/src/platformsupport/glxconvenience/qglxconvenience.cpp b/src/platformsupport/glxconvenience/qglxconvenience.cpp
index 0c2b757920..8d2e58b57b 100644
--- a/src/platformsupport/glxconvenience/qglxconvenience.cpp
+++ b/src/platformsupport/glxconvenience/qglxconvenience.cpp
@@ -172,7 +172,8 @@ bool QXcbSoftwareOpenGLEnforcer::forceSoftwareOpenGL = false;
 template <class T>
 struct QXlibScopedPointerDeleter {
     static inline void cleanup(T *pointer) {
-        XFree(pointer);
+        if (pointer)
+            XFree(pointer);
     }
 };
 
@@ -217,6 +218,8 @@ GLXFBConfig qglx_findConfig(Display *display, int screen , QSurfaceFormat format
             }
 
             QXlibPointer<XVisualInfo> visual(glXGetVisualFromFBConfig(display, candidate));
+            if (visual.isNull())
+                continue;
 
             const int actualRed = qPopulationCount(visual->red_mask);
             const int actualGreen = qPopulationCount(visual->green_mask);