diff --git a/changelog/18729.txt b/changelog/18729.txt
new file mode 100644
index 000000000..975d0274b
--- /dev/null
+++ b/changelog/18729.txt
@@ -0,0 +1,3 @@
+```release-note:bug
+sdk/backend: prevent panic when computing the zero value for a `TypeInt64` schema field.
+```
\ No newline at end of file
diff --git a/sdk/framework/backend.go b/sdk/framework/backend.go
index 67ad2a8ed..3a6b0d804 100644
--- a/sdk/framework/backend.go
+++ b/sdk/framework/backend.go
@@ -752,6 +752,8 @@ func (t FieldType) Zero() interface{} {
 		return ""
 	case TypeInt:
 		return 0
+	case TypeInt64:
+		return int64(0)	 
 	case TypeBool:
 		return false
 	case TypeMap: