diff -urN NetworkManager-1.26.6.orig/src/nm-core-utils.c NetworkManager-1.26.6/src/nm-core-utils.c
--- NetworkManager-1.26.6.orig/src/nm-core-utils.c	2021-06-03 14:10:00.375398397 -0600
+++ NetworkManager-1.26.6/src/nm-core-utils.c	2021-06-03 14:10:35.298882064 -0600
@@ -1759,7 +1759,8 @@
 
 		_pattern_parse (patterns[i], &p, &is_inverted, &is_mandatory);
 
-		match = (fnmatch (p, str, 0) == 0);
+		match = (fnmatch (p, str ?: "", 0) == 0);
+
 		if (is_inverted)
 			match = !match;