diff --git a/src/ankisyncd/sync.py b/src/ankisyncd/sync.py
index 9db4e76..99ce184 100644
--- a/src/ankisyncd/sync.py
+++ b/src/ankisyncd/sync.py
@@ -73,9 +73,40 @@ class Syncer(object):
         if 'crt' in rchg:
             self.col.crt = rchg['crt']
         self.prepareToChunk()
-
+#     this fn was cloned from anki module(version 2.1.36)
+    def basicCheck(self) -> bool:
+        "Basic integrity check for syncing. True if ok."
+        # cards without notes
+        if self.col.db.scalar(
+            """
+select 1 from cards where nid not in (select id from notes) limit 1"""
+        ):
+            return False
+        # notes without cards or models
+        if self.col.db.scalar(
+            """
+select 1 from notes where id not in (select distinct nid from cards)
+or mid not in %s limit 1"""
+            % ids2str(self.col.models.ids())
+        ):
+            return False
+        # invalid ords
+        for m in self.col.models.all():
+            # ignore clozes
+            if m["type"] != MODEL_STD:
+                continue
+            if self.col.db.scalar(
+                """
+select 1 from cards where ord not in %s and nid in (
+select id from notes where mid = ?) limit 1"""
+                % ids2str([t["ord"] for t in m["tmpls"]]),
+                m["id"],
+            ):
+                return False
+        return True
+    
     def sanityCheck(self, full):
-        if not self.col.basicCheck():
+        if not self.basicCheck():
             return "failed basic check"
         for t in "cards", "notes", "revlog", "graves":
             if self.col.db.scalar(
@@ -573,7 +604,7 @@ class FullSyncer(HttpSyncer):
         # make sure it's ok before we try to upload
         if self.col.db.scalar("pragma integrity_check") != "ok":
             return False
-        if not self.col.basicCheck():
+        if not self.basicCheck():
             return False
         # apply some adjustments, then upload
         self.col.beforeUpload()