Catch the error in #760

app/Import/Object/ImportJournal.php

@@ -85,6 +85,7 @@ class ImportJournal
 
     /**
      * @return string
+     * @throws FireflyException
      */
     public function getAmount(): string
     {
@@ -102,6 +103,9 @@ class ImportJournal
                 }
             }
         }
+        if(bccomp($this->amount,'0') === 0) {
+            throw new FireflyException('Amount is zero.');
+        }
 
         return $this->amount;
     }