Add type check
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@ -2019,7 +2019,7 @@ async function importTheme(file) {
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throw new Error('Theme with that name already exists');
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}
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if (parsed.custom_css.includes('@import')) {
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if (typeof parsed.custom_css === 'string' && parsed.custom_css.includes('@import')) {
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const confirm = await callPopup('This theme contains @import lines in the Custom CSS. Press "Yes" to proceed.', 'confirm', '', { okButton: 'Yes' });
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if (!confirm) {
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throw new Error('Theme contains @import lines');
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