diff --git a/app/scripts/plugins/plugin.js b/app/scripts/plugins/plugin.js
index bd2873dd..9a52e456 100644
--- a/app/scripts/plugins/plugin.js
+++ b/app/scripts/plugins/plugin.js
@@ -303,27 +303,35 @@ class Plugin extends Model {
     }
 
     applyCss(name, data, theme) {
-        return Promise.resolve().then(() => {
-            const blob = new Blob([data], { type: 'text/css' });
-            const objectUrl = URL.createObjectURL(blob);
-            const id = 'plugin-css-' + name;
-            const el = this.createElementInHead('link', id, {
-                rel: 'stylesheet',
-                href: objectUrl
-            });
-            el.addEventListener('load', () => URL.revokeObjectURL(objectUrl));
-            if (theme) {
-                const locKey = this.getThemeLocaleKey(theme.name);
-                SettingsManager.allThemes[theme.name] = locKey;
-                BaseLocale[locKey] = theme.title;
-                for (const styleSheet of Array.from(document.styleSheets)) {
-                    if (styleSheet.ownerNode.id === id) {
-                        this.processThemeStyleSheet(styleSheet, theme);
-                        break;
+        return new Promise((resolve, reject) => {
+            try {
+                const blob = new Blob([data], { type: 'text/css' });
+                const objectUrl = URL.createObjectURL(blob);
+                const id = 'plugin-css-' + name;
+                const el = this.createElementInHead('link', id, {
+                    rel: 'stylesheet',
+                    href: objectUrl
+                });
+                el.addEventListener('load', () => {
+                    URL.revokeObjectURL(objectUrl);
+                    if (theme) {
+                        const locKey = this.getThemeLocaleKey(theme.name);
+                        SettingsManager.allThemes[theme.name] = locKey;
+                        BaseLocale[locKey] = theme.title;
+                        for (const styleSheet of Array.from(document.styleSheets)) {
+                            if (styleSheet.ownerNode.id === id) {
+                                this.processThemeStyleSheet(styleSheet, theme);
+                                break;
+                            }
+                        }
                     }
-                }
+                    this.logger.debug('Plugin style installed');
+                    resolve();
+                });
+            } catch (e) {
+                this.logger.error('Error installing plugin style', e);
+                reject(e);
             }
-            this.logger.debug('Plugin style installed');
         });
     }
 
diff --git a/app/styles/base/_theme-vars.scss b/app/styles/base/_theme-vars.scss
index 83b2fb51..1e47ae73 100644
--- a/app/styles/base/_theme-vars.scss
+++ b/app/styles/base/_theme-vars.scss
@@ -1,54 +1,26 @@
+/* prettier-ignore */
+/* This file is also parsed in JS to build theme styles, see theme-vars.js */
 @function set-theme-vars($t) {
     @return map-merge(
         $t,
         (
-            muted-color:
-                mix(
-                    map-get($t, medium-color),
-                    map-get($t, background-color),
-                    map-get($t, mute-percent)
-                ),
-            muted-color-border:
-                mix(
-                    map-get($t, medium-color),
-                    map-get($t, background-color),
-                    semi-mute-percent(map-get($t, mute-percent))
-                ),
+            muted-color: mix(map-get($t, medium-color), map-get($t, background-color), map-get($t, mute-percent)),
+            muted-color-border: mix(map-get($t, medium-color), map-get($t, background-color), semi-mute-percent(map-get($t, mute-percent))),
             text-selection-bg-color: rgba(map-get($t, action-color), 0.3),
             text-selection-bg-color-error: rgba(map-get($t, error-color), 0.8),
             text-semi-muted-color: mix(map-get($t, action-color), map-get($t, text-color), 0.5),
-            text-contrast-action-color:
-                text-contrast-color(
-                    map-get($t, action-color),
-                    map-get($t, color-lightness-shift),
-                    map-get($t, background-color),
-                    map-get($t, text-color)
-                ),
-            text-contrast-error-color:
-                text-contrast-color(
-                    map-get($t, error-color),
-                    map-get($t, color-lightness-shift),
-                    map-get($t, background-color),
-                    map-get($t, text-color)
-                ),
+            text-contrast-action-color: text-contrast-color(map-get($t, action-color), map-get($t, color-lightness-shift), map-get($t, background-color), map-get($t, text-color)),
+            text-contrast-error-color: text-contrast-color(map-get($t, error-color), map-get($t, color-lightness-shift), map-get($t, background-color), map-get($t, text-color)),
             base-border-color: mix(map-get($t, medium-color), map-get($t, background-color), 50%),
             accent-border-color: mix(map-get($t, medium-color), map-get($t, background-color), 65%),
-            light-border-color:
-                mix(
-                    map-get($t, medium-color),
-                    map-get($t, background-color),
-                    map-get($t, light-border-percent)
-                ),
+            light-border-color: mix(map-get($t, medium-color), map-get($t, background-color), map-get($t, light-border-percent)),
             form-box-border-focus: map-get($t, action-color),
             form-box-shadow-color-focus: lightness-alpha(map-get($t, action-color), -5%, -0.3),
             form-box-shadow-color-focus-error: lightness-alpha(map-get($t, error-color), -5%, -0.3),
             dropdown-box-shadow-color: rgba(map-get($t, medium-color), 0.05),
-            secondary-background-color:
-                mix(map-get($t, medium-color), map-get($t, background-color), 10%),
-            intermediate-background-color:
-                mix(map-get($t, medium-color), map-get($t, background-color), 3%),
-            intermediate-pressed-background-color:
-                mix(map-get($t, medium-color), map-get($t, background-color), 2.6%),
+            secondary-background-color: mix(map-get($t, medium-color), map-get($t, background-color), 10%),
+            intermediate-background-color: mix(map-get($t, medium-color), map-get($t, background-color), 3%),
+            intermediate-pressed-background-color: mix(map-get($t, medium-color), map-get($t, background-color), 2.6%),
             disabled-background-color: shade(map-get($t, background-color), 5%),
             action-background-color-focus: shade(map-get($t, action-color), 20%),
             action-background-color-focus-tr: rgba(shade(map-get($t, action-color), 20%), 0.1),
diff --git a/release-notes.md b/release-notes.md
index 24b44a15..40fae726 100644
--- a/release-notes.md
+++ b/release-notes.md
@@ -1,5 +1,8 @@
 Release notes
 -------------
+##### v1.13.4 (2020-04-15)
+`-` fix #1457: fixed styles in theme plugins  
+
 ##### v1.13.3 (2020-04-11)
 `-` fix #1451: fixed slow global auto-type on desktop