diff --git a/src/common/mimecmn.cpp b/src/common/mimecmn.cpp
index 278d3bc4af..38a97a155b 100644
--- a/src/common/mimecmn.cpp
+++ b/src/common/mimecmn.cpp
@@ -207,7 +207,8 @@ wxFileType::wxFileType()
 
 wxFileType::~wxFileType()
 {
-    delete m_impl;
+    if ( m_impl )
+        delete m_impl;
 }
 
 bool wxFileType::GetExtensions(wxArrayString& extensions)