diff --git a/app/modules/cron.c b/app/modules/cron.c
index 4a18a7325e..9604801894 100644
--- a/app/modules/cron.c
+++ b/app/modules/cron.c
@@ -78,6 +78,7 @@ static int lcron_parsedesc(lua_State *L, char *str, struct cronent_desc *desc) {
 static int lcron_create(lua_State *L) {
   // Check arguments
   char *strdesc = (char*)luaL_checkstring(L, 1);
+  void *newlist;
   luaL_checkanyfunction(L, 2);
   // Parse description
   struct cronent_desc desc;
@@ -93,8 +94,12 @@ static int lcron_create(lua_State *L) {
   // Set entry
   ud->desc = desc;
   // Store entry
+  newlist = os_realloc(cronent_list, sizeof(int) * (cronent_count + 1));
+  if (newlist == NULL) {
+    return luaL_error(L, "out of memory");
+  }
   lua_pushvalue(L, -1);
-  cronent_list = os_realloc(cronent_list, sizeof(int) * (cronent_count + 1));
+  cronent_list = newlist;
   cronent_list[cronent_count++] = luaL_ref(L, LUA_REGISTRYINDEX);
   return 1;
 }
@@ -120,8 +125,13 @@ static int lcron_schedule(lua_State *L) {
   ud->desc = desc;
   size_t i = lcron_findindex(L, ud);
   if (i == -1) {
+    void *newlist;
+    newlist = os_realloc(cronent_list, sizeof(int) * (cronent_count + 1));
+    if (newlist == NULL) {
+      return luaL_error(L, "out of memory");
+    }
+    cronent_list = newlist;
     lua_pushvalue(L, 1);
-    cronent_list = os_realloc(cronent_list, sizeof(int) * (cronent_count + 1));
     cronent_list[cronent_count++] = lua_ref(L, LUA_REGISTRYINDEX);
   }
   return 0;