diff --git a/chainsyncer/filter.py b/chainsyncer/filter.py
index 6194f88..627aeca 100644
--- a/chainsyncer/filter.py
+++ b/chainsyncer/filter.py
@@ -43,6 +43,7 @@ class FilterState:
         self.state_store.add('RESET')
 
         self.state = self.state_store.state
+        self.elements = self.state_store.elements
         self.put = self.state_store.put
         self.mask = self.state_store.mask
         self.name = self.state_store.name
diff --git a/chainsyncer/runnable/lock.py b/chainsyncer/runnable/lock.py
index 10e0386..20e8a72 100644
--- a/chainsyncer/runnable/lock.py
+++ b/chainsyncer/runnable/lock.py
@@ -135,9 +135,6 @@ def main():
         else:
             locked_item.advance(ignore_lock=True)
             store.filter_state.unset(locked_item_key, lock_state)
-            #next_filter = filter_list[filter_pos]
-            #next_state = store.filter_state.from_name(next_filter)
-            #store.filter_state.move(next_state)
     else:
         filter_mask = 0xf
         filter_state = store.filter_state.mask(locked_state, filter_mask)
diff --git a/chainsyncer/store/base.py b/chainsyncer/store/base.py
index a36ed37..5b28933 100644
--- a/chainsyncer/store/base.py
+++ b/chainsyncer/store/base.py
@@ -47,7 +47,8 @@ class SyncItem:
 
         (self.cursor, self.tx_cursor, self.target) = sync_state_deserialize(v)
 
-        if self.filter_state.state(self.state_key) & self.filter_state.from_name('LOCK') > 0 and not ignore_lock:
+        filter_state = self.filter_state.state(self.state_key)
+        if filter_state  & self.filter_state.from_name('LOCK') > 0 and not ignore_lock:
             raise LockError(self.state_key)
 
         self.count = len(self.filter_state.all(pure=True)) - 4
@@ -56,7 +57,7 @@ class SyncItem:
             self.skip_filter = True
         elif not started:
             self.filter_state.move(self.state_key, self.filter_state.from_name('RESET'))
-
+        
 
     def __check_done(self):
         if self.filter_state.state(self.state_key) & self.filter_state.from_name('INTERRUPT') > 0:
@@ -65,6 +66,16 @@ class SyncItem:
             raise FilterDone(self.state_key)
 
 
+    def resume(self):
+        filter_state = self.filter_state.state(self.state_key)
+        if filter_state > 0x0f:
+            filter_state_part = self.filter_state.mask(filter_state, 0x0f)
+            if len(self.filter_state.elements(filter_state)) == 1:
+                logg.info('resume execution on state {} ({})'.format(self.filter_state.name(filter_state_part), filter_state_part))
+                lock_state = self.filter_state.from_name('LOCK')
+                self.filter_state.set(lock_state)
+
+
     def reset(self, check_incomplete=True):
         if check_incomplete:
             if self.filter_state.state(self.state_key) & self.filter_state.from_name('LOCK') > 0:
@@ -210,6 +221,7 @@ class SyncStore:
             self.state.put(block_number_str, contents=state_bytes)
             self.filter_state.put(block_number_str)
             o = SyncItem(offset, target, self.state, self.filter_state, ignore_lock=ignore_lock)
+            o.resume()
             self.items[offset] = o
             self.item_keys.append(offset)
         elif offset > 0:
@@ -259,6 +271,7 @@ class SyncStore:
             if i < lim:
                 item_target = thresholds[i+1] 
             o = SyncItem(block_number, item_target, self.state, self.filter_state, started=True, ignore_lock=ignore_lock)
+            o.resume()
             self.items[block_number] = o
             self.item_keys.append(block_number)
             logg.info('added existing {}'.format(o))
diff --git a/requirements.txt b/requirements.txt
index 8505b96..885acf9 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,5 +1,5 @@
 confini~=0.6.0
 semver==2.13.0
 hexathon~=0.1.5
-chainlib>=0.1.0b1,<0.2.0
+chainlib~=0.1.1
 shep~=0.2.3