Corrected bug on no-extension

src/core.c

@@ -1798,6 +1798,8 @@ bool IsFileExtension(const char *fileName, const char *ext)
     bool result = false;
     const char *fileExt = GetExtension(fileName);
 
+    if (fileExt != NULL)
+    {
         int extCount = 0;
         const char **checkExts = TextSplit(ext, ';', &extCount);
 
@@ -1809,6 +1811,7 @@ bool IsFileExtension(const char *fileName, const char *ext)
                 break;
             }
         }
+    }
 
     return result;
 }