diff --git a/server-plugins/process-resources/src/index.ts b/server-plugins/process-resources/src/index.ts
index f8dd3ccd84..af7cd7d991 100644
--- a/server-plugins/process-resources/src/index.ts
+++ b/server-plugins/process-resources/src/index.ts
@@ -75,7 +75,10 @@ import {
   Split,
   Subtract,
   Trim,
-  UpperCase
+  UpperCase,
+  EmptyArray,
+  ExecutionInitiator,
+  ExecutionStarted
 } from './transform'
 import {
   RunSubProcess,
@@ -428,7 +431,10 @@ export default async () => ({
     Insert,
     Remove,
     RemoveFirst,
-    RemoveLast
+    RemoveLast,
+    EmptyArray,
+    ExecutionInitiator,
+    ExecutionStarted
   },
   rollbacks: {
     ToDoCloseRollback,
diff --git a/server-plugins/process-resources/src/transform.ts b/server-plugins/process-resources/src/transform.ts
index b2b372ba4e..1cf861cc1f 100644
--- a/server-plugins/process-resources/src/transform.ts
+++ b/server-plugins/process-resources/src/transform.ts
@@ -50,6 +50,9 @@ export async function Insert (
   control: ProcessControl,
   execution: Execution
 ): Promise<Doc[]> {
+  if (value == null) {
+    value = []
+  }
   if (!Array.isArray(value)) return value
   if (props.value == null) return value
   const context = parseContext(props.value)
@@ -68,6 +71,9 @@ export async function Remove (
   control: ProcessControl,
   execution: Execution
 ): Promise<Doc[]> {
+  if (value == null) {
+    value = []
+  }
   if (!Array.isArray(value)) return value
   if (props.value == null) return value
   const context = parseContext(props.value)
@@ -80,11 +86,17 @@ export async function Remove (
 }
 
 export function RemoveFirst (value: Doc[], props: Record<string, any>): Doc[] {
+  if (value == null) {
+    value = []
+  }
   if (!Array.isArray(value)) return value
   return value.slice(1)
 }
 
 export function RemoveLast (value: Doc[], props: Record<string, any>): Doc[] {
+  if (value == null) {
+    value = []
+  }
   if (!Array.isArray(value)) return value
   return value.slice(0, -1)
 }