Index: contrib/one-true-awk/run.c
===================================================================
--- contrib/one-true-awk/run.c
+++ contrib/one-true-awk/run.c
@@ -965,6 +965,8 @@
 		}
 		tempfree(x);
 		p += strlen(p);
+		if (*s == '\0')
+			break;
 		s++;
 	}
 	*p = '\0';