Fix bug in tx_list (ethereum#323)

tony-ricciardi · Jul 9, 2019 · 6f22f7b · 6f22f7b
1 parent 11eeabc
commit 6f22f7b
Showing 1 changed file with 7 additions and 2 deletions.
diff --git a/core/tx_list.go b/core/tx_list.go
@@ -564,8 +564,13 @@ func (l *txPricedList) Discard(count int, local *accountSet) types.Transactions
 // Retrieves the heap with the lowest normalized price at it's head
 func (l *txPricedList) getHeapWithMinHead() (*priceHeap, *types.Transaction) {
 	// Initialize it to the nilCurrencyHeap
-	var cheapestHeap *priceHeap = l.nilCurrencyHeap
-	var cheapestTxn *types.Transaction = []*types.Transaction(*l.nilCurrencyHeap)[0]
+	var cheapestHeap *priceHeap
+	var cheapestTxn *types.Transaction
+
+	if len(*l.nilCurrencyHeap) > 0 {
+		cheapestHeap = l.nilCurrencyHeap
+		cheapestTxn = []*types.Transaction(*l.nilCurrencyHeap)[0]
+	}
 
 	for _, priceHeap := range l.nonNilCurrencyHeaps {
 		if len(*priceHeap) > 0 {