[BUGFIX] Fix sourcemap generation errors in css files

core/tasks/css.js

@@ -176,19 +176,14 @@ module.exports = class Css extends Task {
 			try {
 				postProcessedCss = await postcss(postCssPlugins).process(cssString, {
 					from: _input,
-					to: _output,
-					map: this._config.cssPipeline.sourceMaps ? {
-						inline: false,
-						annotation: path.join(path.relative(path.dirname(_output), path.dirname(sourceMapPath)), path.basename(sourceMapPath)),
-						sourcesContent: true
-					} : false
+					to: _output
 				});
 			} catch (_error) {
 				this._handleError(`${_error.message}`);
 			}
 
 			await this._writeFile(_output, postProcessedCss.css);
-			if (this._config.cssPipeline.sourceMaps) {
+			if (this._config.cssPipeline.sourceMaps && postProcessedCss.map) {
 				await this._writeFile(sourceMapPath, postProcessedCss.map);
 			}