diff --git a/setup.py b/setup.py
index 1ee6f23..b271ed1 100644
--- a/setup.py
+++ b/setup.py
@@ -31,7 +31,7 @@ def finalize_options(self):
 
 setup(
     name="tonpy" if not IS_DEV else "tonpy-dev",
-    version="0.0.0.1.4b0" if not IS_DEV else "0.0.0.6.0b1",
+    version="0.0.0.1.4c0" if not IS_DEV else "0.0.0.6.0b1",
     author="Disintar LLP",
     author_email="andrey@head-labs.com",
     description="Types / API for TON blockchain",
diff --git a/src/tonpy/abi/getter.py b/src/tonpy/abi/getter.py
index 7f45fee..0d41b20 100644
--- a/src/tonpy/abi/getter.py
+++ b/src/tonpy/abi/getter.py
@@ -299,18 +299,21 @@ def parse_getters(self, tvm: TVM, tlb_sources, force_all: bool = False) -> dict:
             getter_cache.set((tvm.code_hash, tvm.data_hash, self.method_id), stack)
 
         if self.result_length_strict_check:
-            assert len(stack) == len(self.method_result)
+            if len(stack) != len(self.method_result):
+                return
 
         if self.result_strict_type_check:
             my_result_hash = stack.get_abi_hash()
-            assert my_result_hash == self.method_result_hash
+            if my_result_hash != self.method_result_hash:
+                return
 
         tmp = {}
 
         for getter, stack_entry in zip(self.method_result, stack):
             if getter.required is not None:
                 stack_entry_value = stack_entry.as_int() if getter.type == "Int" else stack_entry.get().get_hash()
-                assert stack_entry_value == getter.required
+                if stack_entry_value != getter.required:
+                    return
 
             try:
                 tmp.update(getter.parse_stack_item(stack_entry, tlb_sources, force_all, tvm=tvm))
@@ -332,18 +335,21 @@ async def aparse_getters(self, tvm: TVM, tlb_sources, force_all: bool = False) -
             getter_cache.set((tvm.code_hash, tvm.data_hash, self.method_id), stack)
 
         if self.result_length_strict_check:
-            assert len(stack) == len(self.method_result)
+            if len(stack) != len(self.method_result):
+                return
 
         if self.result_strict_type_check:
             my_result_hash = stack.get_abi_hash()
-            assert my_result_hash == self.method_result_hash
+            if my_result_hash != self.method_result_hash:
+                return
 
         tmp = {}
 
         for getter, stack_entry in zip(self.method_result, stack):
             if getter.required is not None:
                 stack_entry_value = stack_entry.as_int() if getter.type == "Int" else stack_entry.get().get_hash()
-                assert stack_entry_value == getter.required
+                if stack_entry_value != getter.required:
+                    return
 
             try:
                 tmp.update(getter.parse_stack_item(stack_entry, tlb_sources, force_all, tvm=tvm))
diff --git a/src/tonpy/abi/interface.py b/src/tonpy/abi/interface.py
index 59400c9..f2fad8d 100644
--- a/src/tonpy/abi/interface.py
+++ b/src/tonpy/abi/interface.py
@@ -43,6 +43,9 @@ def parse_getters(self, tvm: TVM, tlb_sources):
             try:
                 tmp = getter.parse_getters(tvm, tlb_sources)
 
+                if tmp is None:
+                    return {}
+
                 for i in tmp:
                     result[f"{self.dton_parse_prefix}{i}"] = tmp[i]
 
@@ -60,6 +63,9 @@ async def aparse_getters(self, tvm: TVM, tlb_sources):
             try:
                 tmp = await getter.aparse_getters(tvm, tlb_sources)
 
+                if tmp is None:
+                    return {}
+
                 for i in tmp:
                     result[f"{self.dton_parse_prefix}{i}"] = tmp[i]
 
diff --git a/src/tonpy/blockscanner/blockscanner.py b/src/tonpy/blockscanner/blockscanner.py
index fc1864c..f88e5e3 100644
--- a/src/tonpy/blockscanner/blockscanner.py
+++ b/src/tonpy/blockscanner/blockscanner.py
@@ -845,7 +845,7 @@ def prepare_prev_block_data(self, shards_data, mc_data):
                     for j in range(i['master'] - 16, i['master']):
                         prev_blocks.append(known_mcs[j].to_data())
 
-                    prev_100_seqno = int(i['master'] - i['master'] % 100)
+                    prev_100_seqno = int((i['master'] - 1) - (i['master'] - 1) % 100)
                     while len(prev_blocks_100) < 16:
                         prev_blocks_100.append(known_mcs[prev_100_seqno].to_data())
                         if prev_100_seqno == 100: