1 files changed, 10 insertions, 5 deletions
diff --git a/ext/syck/yaml2byte.c b/ext/syck/yaml2byte.c
index 46173e861e..61cd8c8eac 100644
--- a/ext/syck/yaml2byte.c
+++ b/ext/syck/yaml2byte.c
@@ -226,12 +226,17 @@ syck_yaml2byte(char *yamlstr)
     syck_parser_implicit_typing( parser, 1 );
     syck_parser_taguri_expansion( parser, 1 );
     oid = syck_parse( parser );
-    syck_lookup_sym( parser, oid, (char **)&sav );
 
-    ret = S_ALLOC_N( char, strlen( sav->buffer ) + 3 );
-    ret[0] = '\0';
-    strcat( ret, "D\n" );
-    strcat( ret, sav->buffer );
+    if ( syck_lookup_sym( parser, oid, (char **)&sav ) == 1 ) {
+        ret = S_ALLOC_N( char, strlen( sav->buffer ) + 3 );
+        ret[0] = '\0';
+        strcat( ret, "D\n" );
+        strcat( ret, sav->buffer );
+    }
+    else
+    {
+        ret = NULL;
+    }
 
     syck_free_parser( parser );
     return ret;