1 files changed, 2 insertions, 0 deletions
diff --git a/misc/json.c b/misc/json.c
index 608cfad861..d30450c49d 100644
--- a/misc/json.c
+++ b/misc/json.c
@@ -255,6 +255,8 @@ static const char special_escape[] = {
 
 static void write_json_str(bstr *b, unsigned char *str)
 {
+    assert(str);
+
     APPEND(b, "\"");
     while (1) {
         unsigned char *cur = str;