diff --git a/CHANGELOG.md b/CHANGELOG.md
index 3fe123316..bf22d31a1 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,4 +1,6 @@
 # Changelog
+- 6.6.6
+  - Fix issue with process global (PR #1166) (issue #1165)
 - 6.6.5
   - Support import fom SQL (`SqlUtils.loadFromSql`) (PR #1103) (issue #911, #593)
   - Fixed type issue with SerializedFunction (PR #1103) (issue #1024)
diff --git a/packages/core/modules/utils/stuff.js b/packages/core/modules/utils/stuff.js
index 3b92075ec..f6647d706 100644
--- a/packages/core/modules/utils/stuff.js
+++ b/packages/core/modules/utils/stuff.js
@@ -521,8 +521,8 @@ export const isJsonCompatible = (tpl, obj, bag = {}, path = []) => {
   }
 };
 
-const isDev = () => (process?.env?.NODE_ENV == "development");
-const isTest = () => (process?.env?.NODE_ENV_TEST == "true");
+const isDev = () => (typeof process !== "undefined" && process?.env?.NODE_ENV == "development");
+const isTest = () => (typeof process !== "undefined" && process?.env?.NODE_ENV_TEST == "true");
 
 export const getLogger = (devMode) => {
   if (isTest()) {
diff --git a/packages/ui/modules/utils/stuff.js b/packages/ui/modules/utils/stuff.js
index b4da25770..52d565e9a 100644
--- a/packages/ui/modules/utils/stuff.js
+++ b/packages/ui/modules/utils/stuff.js
@@ -97,8 +97,8 @@ function shallowEqualObjects(objA, objB, deep = false) {
 }
 
 
-const isDev = () => (process?.env?.NODE_ENV == "development");
-const isTest = () => (process?.env?.NODE_ENV_TEST == "true");
+const isDev = () => (typeof process !== "undefined" && process?.env?.NODE_ENV == "development");
+const isTest = () => (typeof process !== "undefined" && process?.env?.NODE_ENV_TEST == "true");
 
 export const getLogger = (devMode) => {
   if (isTest()) {