diff --git a/lua/zapret-lib.lua b/lua/zapret-lib.lua
index 8a47425..68c7d32 100644
--- a/lua/zapret-lib.lua
+++ b/lua/zapret-lib.lua
@@ -632,7 +632,7 @@ function tls_mod_shim(desync, blob, modlist, payload)
 		if not val then
 			error("tls_mod_shim: non-existent var '"..var.."'")
 		end
-		modlist = string.sub(modlist,1,p1+3)..val..string.sub(modlist,p2+1)
+		modlist = string.sub(modlist,1,p1+3)..tostring(val)..string.sub(modlist,p2+1)
 	end
 	return tls_mod(blob,modlist,payload)
 end
diff --git a/nfq2/lua.c b/nfq2/lua.c
index a2df011..521e469 100644
--- a/nfq2/lua.c
+++ b/nfq2/lua.c
@@ -1868,7 +1868,7 @@ static bool lua_reconstruct_ip6exthdr(lua_State *L, int idx, struct ip6_hdr *ip6
 {
 	LUA_STACK_GUARD_ENTER(L)
 	// proto = last header type
-	if (*len<sizeof(struct tcphdr)) return false;
+	if (*len<sizeof(struct ip6_hdr)) return false;
 
 	uint8_t *last_proto = &ip6->ip6_ctlun.ip6_un1.ip6_un1_nxt;
 	size_t filled = sizeof(struct ip6_hdr);
diff --git a/nfq2/protocol.c b/nfq2/protocol.c
index 110b295..b4f0bcc 100644
--- a/nfq2/protocol.c
+++ b/nfq2/protocol.c
@@ -331,7 +331,7 @@ bool IsHttpReply(const uint8_t *data, size_t len)
 		data[10]>='0' && data[10]<='9' &&
 		data[11]>='0' && data[11]<='9';
 }
-int HttpReplyCode(const uint8_t *data, size_t len)
+int HttpReplyCode(const uint8_t *data)
 {
 	return (data[9]-'0')*100 + (data[10]-'0')*10 + (data[11]-'0');
 }
@@ -370,7 +370,7 @@ bool HttpReplyLooksLikeDPIRedirect(const uint8_t *data, size_t len, const char *
 	
 	if (!host || !*host || !IsHttpReply(data, len)) return false;
 	
-	code = HttpReplyCode(data,len);
+	code = HttpReplyCode(data);
 	
 	if ((code!=302 && code!=307) || !HttpExtractHeader(data,len,"\nLocation:",loc,sizeof(loc))) return false;
 
diff --git a/nfq2/protocol.h b/nfq2/protocol.h
index 94b0438..9c3792d 100644
--- a/nfq2/protocol.h
+++ b/nfq2/protocol.h
@@ -104,7 +104,7 @@ bool HttpExtractHeader(const uint8_t *data, size_t len, const char *header, char
 bool HttpExtractHost(const uint8_t *data, size_t len, char *host, size_t len_host);
 bool IsHttpReply(const uint8_t *data, size_t len);
 // must be pre-checked by IsHttpReply
-int HttpReplyCode(const uint8_t *data, size_t len);
+int HttpReplyCode(const uint8_t *data);
 // must be pre-checked by IsHttpReply
 bool HttpReplyLooksLikeDPIRedirect(const uint8_t *data, size_t len, const char *host);