From e8ea6bf1e7d9f22a964a9e7e13bc68debb0a7954 Mon Sep 17 00:00:00 2001
From: Christian Grothoff <christian@grothoff.org>
Date: Fri, 14 Aug 2020 13:07:53 +0200
Subject: fix bug: case where this is the first refund

---
 src/lib/exchange_api_refund.c | 19 +++++++++++++------
 1 file changed, 13 insertions(+), 6 deletions(-)

diff --git a/src/lib/exchange_api_refund.c b/src/lib/exchange_api_refund.c
index ee634e7f6..55f71757c 100644
--- a/src/lib/exchange_api_refund.c
+++ b/src/lib/exchange_api_refund.c
@@ -377,13 +377,20 @@ verify_conflict_history_ok (struct TALER_EXCHANGE_RefundHandle *rh,
 
     TALER_amount_ntoh (&amount,
                        &rh->depconf.refund_amount);
-    if (0 >
-        TALER_amount_add (&rtotal,
-                          &rtotal,
-                          &amount))
+    if (have_refund)
     {
-      GNUNET_break (0);
-      return GNUNET_SYSERR;
+      if (0 >
+          TALER_amount_add (&rtotal,
+                            &rtotal,
+                            &amount))
+      {
+        GNUNET_break (0);
+        return GNUNET_SYSERR;
+      }
+    }
+    else
+    {
+      rtotal = amount;
     }
   }
   if (-1 == TALER_amount_cmp (&dtotal,
-- 
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