diff --git a/lightningd/jsonrpc.c b/lightningd/jsonrpc.c
index 49e24551f..7be5ccc54 100644
--- a/lightningd/jsonrpc.c
+++ b/lightningd/jsonrpc.c
@@ -150,7 +150,10 @@ static void json_getlog(struct command *cmd,
 	struct log_book *lr = cmd->ld->log_book;
 	jsmntok_t *level;
 
-	json_get_params(buffer, params, "?level", &level, NULL);
+	if (!json_get_params(buffer, params, "?level", &level, NULL)) {
+		command_fail(cmd, "Invalid arguments");
+		return;
+	}
 
 	info.num_skipped = 0;
 
diff --git a/lightningd/peer_control.c b/lightningd/peer_control.c
index c60035afe..bfe047643 100644
--- a/lightningd/peer_control.c
+++ b/lightningd/peer_control.c
@@ -945,7 +945,10 @@ static void json_getpeers(struct command *cmd,
 	struct getpeers_args *gpa = tal(cmd, struct getpeers_args);
 
 	gpa->cmd = cmd;
-	json_get_params(buffer, params, "?level", &leveltok, NULL);
+	if (!json_get_params(buffer, params, "?level", &leveltok, NULL)) {
+		command_fail(cmd, "Invalid arguments");
+		return;
+	}
 
 	if (leveltok) {
 		gpa->ll = tal(gpa, enum log_level);