diff --git a/ord/ord.go b/ord/ord.go
index c0767d9..dc2d27b 100644
--- a/ord/ord.go
+++ b/ord/ord.go
@@ -67,13 +67,17 @@ func ScriptFromTape(tape bpu.Tape) (ordScript []bpu.Cell) {
 	endIdx := 0
 	// Find OP_IF and OP_ENDIF indexes
 	for idx, c := range tape.Cell {
-		if idx > 0 && c.Ops != nil && *c.Ops == "OP_IF" && *tape.Cell[idx-1].Op == 0 {
+		if idx > 0 && c.Ops != nil && *c.Ops == "OP_IF" && tape.Cell[idx-1].Op != nil && *tape.Cell[idx-1].Op == 0 {
 			startIdx = idx - 1
 		}
 
 		if startIdx > 0 && c.Ops != nil && *c.Ops == "OP_ENDIF" {
 			endIdx = idx
+			break
 		}
 	}
+	if startIdx > endIdx {
+		return []bpu.Cell{}
+	}
 	return tape.Cell[startIdx:endIdx]
 }