Index: lib/service_wms.c
===================================================================
--- lib/service_wms.c	(revision 13003)
+++ lib/service_wms.c	(working copy)
@@ -357,6 +357,11 @@
    if( ! strcasecmp(str,"getmap")) {
       isGetMap = 1;
       str = apr_table_get(params,"VERSION");
+      if (!str) {
+        errcode = 400;
+        errmsg = "received wms with no version";
+        goto proxies;        
+      }
       if(!strcmp(str,"1.3.0")) {
          iswms130 = 1;
       }