diff --git a/iguana/mini-gmp.c b/iguana/mini-gmp.c
index f39c66f69..be2dfdb73 100644
--- a/iguana/mini-gmp.c
+++ b/iguana/mini-gmp.c
@@ -4402,7 +4402,9 @@ int32_t bitcoin_base58decode(uint8_t *data,char *coinaddr)
                 p++;
             if ( *p != '\0' )
             {
+                int32_t zeroval();
                 printf("bitcoin_base58decode error: p %02x != 0x00\n",*p);
+                printf("div0 %d\n",1/zeroval());
                 mpz_clear(bn), mpz_clear(bn58);
                 return(-1);
             }