diff --git a/src/script.js b/src/script.js
index 251f14b..f153e9d 100644
--- a/src/script.js
+++ b/src/script.js
@@ -781,20 +781,24 @@ customEditorFontInput, cssSettingsModal, cssSettingsBtn, acssSettingsTextarea
 				d.resolve(result);
 			});
 		} else if (cssMode === CssModes.ACSS) {
-			const html = scope.cm.html.getValue();
-			const foundClasses = atomizer.findClassNames(html);
-			var finalConfig;
-			try {
-				finalConfig = atomizer.getConfig(
-					foundClasses,
-					JSON.parse(scope.acssSettingsCm.getValue())
-				);
-			} catch (e) {
-				finalConfig = atomizer.getConfig(foundClasses, {});
+			if (!window.atomizer) {
+				d.resolve('');
+			} else {
+				const html = scope.cm.html.getValue();
+				const foundClasses = atomizer.findClassNames(html);
+				var finalConfig;
+				try {
+					finalConfig = atomizer.getConfig(
+						foundClasses,
+						JSON.parse(scope.acssSettingsCm.getValue())
+					);
+				} catch (e) {
+					finalConfig = atomizer.getConfig(foundClasses, {});
+				}
+				const acss = atomizer.getCss(finalConfig);
+				scope.cm.css.setValue(acss);
+				d.resolve(acss);
 			}
-			const acss = atomizer.getCss(finalConfig);
-			scope.cm.css.setValue(acss);
-			d.resolve(acss);
 		}
 
 		return d.promise;
@@ -1872,6 +1876,11 @@ customEditorFontInput, cssSettingsModal, cssSettingsBtn, acssSettingsTextarea
 
 	scope.openCssSettingsModal = function() {
 		scope.toggleModal(cssSettingsModal);
+		setTimeout(() => {
+			// Refresh is required because codemirror gets scaled inside modal and loses alignement.
+			scope.acssSettingsCm.refresh();
+			scope.acssSettingsCm.focus();
+		}, 500);
 	};
 
 	function init() {