diff --git a/src/lib/transform-content-atrule.js b/src/lib/transform-content-atrule.js
index e9f7d39..dba3cf2 100644
--- a/src/lib/transform-content-atrule.js
+++ b/src/lib/transform-content-atrule.js
@@ -20,7 +20,9 @@ export default function transformContentAtrule(rule, opts) {
 			// transform the clone children
 			return transformNode(clone, opts).then(() => {
 				// replace the @content at-rule with the clone children
-				rule.parent.insertBefore(rule, clone.nodes);
+				if (clone.nodes) {
+					rule.parent.insertBefore(rule, clone.nodes);
+				}
 
 				rule.remove();
 			})
diff --git a/test/mixins.css b/test/mixins.css
index 76ce5d1..80253a5 100644
--- a/test/mixins.css
+++ b/test/mixins.css
@@ -69,3 +69,12 @@ $default-radius: 2em;
 		min-width: $min-width;
 	}
 }
+
+.test-5c {
+	@include mixin-test-5(50em) {
+	}
+}
+
+.test-5d {
+	@include mixin-test-5(20em);
+}
diff --git a/test/mixins.expect.css b/test/mixins.expect.css
index 6fc25fe..49d6713 100644
--- a/test/mixins.expect.css
+++ b/test/mixins.expect.css
@@ -51,3 +51,13 @@
 		min-width: 60em;
 	}
 }
+
+.test-5c {
+	@media (min-width: 50em) {
+	}
+}
+
+.test-5d {
+	@media (min-width: 20em) {
+	}
+}