diff --git a/src/apexcharts-card.ts b/src/apexcharts-card.ts
index 88fba11..4b65b5a 100644
--- a/src/apexcharts-card.ts
+++ b/src/apexcharts-card.ts
@@ -259,7 +259,11 @@ class ChartsCard extends LitElement {
       delete (configDup as any).entities;
     }
     configDup = configDup as ChartCardExternalConfig;
-    if (configDup.config_templates && configDup.config_templates.length > 0) {
+    if (configDup.config_templates) {
+      configDup.config_templates =
+        configDup.config_templates && Array.isArray(configDup.config_templates)
+          ? configDup.config_templates
+          : [configDup.config_templates];
       configDup = mergeConfigTemplates(getLovelace(), configDup);
     }
     try {
diff --git a/src/types-config-ti.ts b/src/types-config-ti.ts
index 3da8b12..06824c4 100644
--- a/src/types-config-ti.ts
+++ b/src/types-config-ti.ts
@@ -6,7 +6,7 @@ import * as t from "ts-interface-checker";
 
 export const ChartCardExternalConfig = t.iface([], {
   "type": t.lit('custom:apexcharts-card'),
-  "config_templates": t.opt(t.array("string")),
+  "config_templates": t.opt(t.union(t.array("string"), "string")),
   "color_list": t.opt(t.array("string")),
   "locale": t.opt("string"),
   "experimental": t.opt(t.iface([], {
diff --git a/src/types-config.ts b/src/types-config.ts
index 83feeeb..5de6e3f 100644
--- a/src/types-config.ts
+++ b/src/types-config.ts
@@ -1,6 +1,6 @@
 export interface ChartCardExternalConfig {
   type: 'custom:apexcharts-card';
-  config_templates?: string[];
+  config_templates?: string[] | string;
   color_list?: string[];
   locale?: string;
   experimental?: {