diff --git a/src/tag.c b/src/tag.c
index 08abd41..4f2426b 100644
--- a/src/tag.c
+++ b/src/tag.c
@@ -1443,6 +1443,8 @@
 	orgpat.len = p_tl;
 
     prepare_pats(&orgpat, has_re);
+    if (has_re && orgpat.regmatch.regprog == NULL)
+	goto findtag_end;
 
 #ifdef FEAT_TAG_BINS
     /* This is only to avoid a compiler warning for using search_info
diff --git a/src/version.c b/src/version.c
index 4b4890c..a2ca238 100644
--- a/src/version.c
+++ b/src/version.c
@@ -720,6 +720,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    650,
+/**/
     649,
 /**/
     648,