--- cmsProp_orig.c	2016-07-05 11:37:09.303694403 +0530
+++ cmsProp.c	2016-07-05 11:37:50.708063729 +0530
@@ -138,6 +138,8 @@
     if (xgwp_ret != Success || format_ret == 0 || nitems_ret == 0) {
 	/* the property does not exist or is of an unexpected type or
            getting window property failed */
+        if(prop_ret)
+            XFree(prop_ret);
 	return(XcmsFailure);
     }