From 7e133870ae2c83b5bb57eca94bbd90ba29f5689c Mon Sep 17 00:00:00 2001
From: Ola Stenberg <hello@olastenberg.com>
Date: Tue, 30 Aug 2022 12:08:13 +0200
Subject: [PATCH] fix: xSushiAgeTranfered null check

---
 subgraphs/bar/src/bar.ts    | 5 ++++-
 subgraphs/bar/template.yaml | 5 +++++
 2 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/subgraphs/bar/src/bar.ts b/subgraphs/bar/src/bar.ts
index 68581204..7a42e5b3 100644
--- a/subgraphs/bar/src/bar.ts
+++ b/subgraphs/bar/src/bar.ts
@@ -282,7 +282,10 @@ export function transfer(event: TransferEvent): void {
     // Recalc xSushi age first
     fromUser.xSushiAge = fromUser.xSushiAge.plus(fromUserDays.times(fromUser.xSushi))
     // Calculate xSushiAge being transfered
-    const xSushiAgeTranfered = fromUser.xSushiAge.div(fromUser.xSushi).times(value)
+    let xSushiAgeTranfered = BigDecimal.fromString('0')
+    if (!fromUser.xSushiAge.equals(BigDecimal.fromString('0')) && !fromUser.xSushi.equals(BigDecimal.fromString('0'))) {
+      xSushiAgeTranfered = fromUser.xSushiAge.div(fromUser.xSushi).times(value)
+    }
     // Subtract from xSushiAge
     fromUser.xSushiAge = fromUser.xSushiAge.minus(xSushiAgeTranfered)
     fromUser.updatedAt = event.block.timestamp
diff --git a/subgraphs/bar/template.yaml b/subgraphs/bar/template.yaml
index acb354c8..fbbdde3f 100644
--- a/subgraphs/bar/template.yaml
+++ b/subgraphs/bar/template.yaml
@@ -1,4 +1,9 @@
 specVersion: 0.0.3
+# features:
+#   - grafting
+# graft:
+#   base: 'QmTSGqvK8kYdNFe8cRJ1S1naUb4C19cB9tijNU872hqc2i'
+#   block: 15439322 #NOTE: the next block had a div by 0 issue
 description: Bar
 repository: https://github.com/sushiswap/sushiswap-subgraph
 schema: