diff --git a/iguana/exchanges/LP_rpc.c b/iguana/exchanges/LP_rpc.c
index 0f78716db..70321218b 100644
--- a/iguana/exchanges/LP_rpc.c
+++ b/iguana/exchanges/LP_rpc.c
@@ -251,6 +251,8 @@ cJSON *LP_gettx(char *symbol,bits256 txid)
     coin = LP_coinfind(symbol);
     if ( coin == 0 )
         return(cJSON_Parse("{\"error\":\"no coin\"}"));
+    if ( bits256_nonz(txid) == 0 )
+        return(cJSON_Parse("{\"error\":\"null txid\"}"));
     if ( coin->electrum == 0 )
     {
         sprintf(buf,"[\"%s\", 1]",bits256_str(str,txid));
@@ -290,6 +292,8 @@ cJSON *LP_gettxout(char *symbol,bits256 txid,int32_t vout)
     coin = LP_coinfind(symbol);
     if ( coin == 0 )
         return(cJSON_Parse("{\"error\":\"no coin\"}"));
+    if ( bits256_nonz(txid) == 0 )
+        return(cJSON_Parse("{\"error\":\"null txid\"}"));
     if ( coin->electrum == 0 )
     {
         sprintf(buf,"[\"%s\", %d, true]",bits256_str(str,txid),vout);
diff --git a/iguana/exchanges/LP_socket.c b/iguana/exchanges/LP_socket.c
index a5204567c..dd79bb4e2 100644
--- a/iguana/exchanges/LP_socket.c
+++ b/iguana/exchanges/LP_socket.c
@@ -502,6 +502,8 @@ cJSON *electrum_getmerkle(char *symbol,struct electrum_info *ep,cJSON **retjsonp
 {
     char params[128],str[65];
     sprintf(params,"[\"%s\", %d]",bits256_str(str,txid),height);
+    if ( bits256_nonz(txid) == 0 )
+        return(cJSON_Parse("{\"error\":\"null txid\"}"));
     return(electrum_submit(symbol,ep,retjsonp,"blockchain.transaction.get_merkle",params,ELECTRUM_TIMEOUT));
 }