diff --git a/iguana/exchanges/LP_instantdex.c b/iguana/exchanges/LP_instantdex.c
index 34560238a..404b04398 100644
--- a/iguana/exchanges/LP_instantdex.c
+++ b/iguana/exchanges/LP_instantdex.c
@@ -288,10 +288,13 @@ int64_t LP_claimtx(void *ctx,struct iguana_info *coin,bits256 *claimtxidp,bits25
 uint32_t LP_claimtime(struct iguana_info *coin,uint32_t expiration)
 {
     uint32_t heighttime,now = (uint32_t)time(NULL);
-    heighttime = LP_heighttime(coin->symbol,coin->height);
-    printf("claimtime: now %u height.%d heighttime.%u expiration.%u\n",now,coin->height,heighttime,expiration);
-    if ( heighttime >= expiration )
-        return(heighttime + 1);
+    if ( coin->height > 0 )
+    {
+        heighttime = LP_heighttime(coin->symbol,coin->height-1);
+        printf("claimtime: now %u height.%d heighttime.%u expiration.%u\n",now,coin->height,heighttime,expiration);
+        if ( heighttime >= expiration )
+            return(heighttime + 1);
+    }
     return(0);
 }