diff --git a/burst-kotlin-plugin-tests/src/test/kotlin/app/cash/burst/kotlin/BurstKotlinPluginTest.kt b/burst-kotlin-plugin-tests/src/test/kotlin/app/cash/burst/kotlin/BurstKotlinPluginTest.kt
index c70d392..924cfba 100644
--- a/burst-kotlin-plugin-tests/src/test/kotlin/app/cash/burst/kotlin/BurstKotlinPluginTest.kt
+++ b/burst-kotlin-plugin-tests/src/test/kotlin/app/cash/burst/kotlin/BurstKotlinPluginTest.kt
@@ -86,7 +86,32 @@ class BurstKotlinPluginTest {
   }
 
   @Test
-  fun unexpectedArgumentType() {
+  fun unexpectedClassArgumentType() {
+    val result = compile(
+      sourceFile = SourceFile.kotlin(
+        "CoffeeTest.kt",
+        """
+        import app.cash.burst.Burst
+        import kotlin.test.Test
+
+        @Burst
+        class CoffeeTest(espresso: String) {
+          @Test
+          fun test() {
+          }
+        }
+        """,
+      ),
+    )
+    assertEquals(KotlinCompilation.ExitCode.COMPILATION_ERROR, result.exitCode, result.messages)
+    assertThat(result.messages).contains(
+      "CoffeeTest.kt:5:18 " +
+        "@Burst parameter must be a boolean, an enum, or have a burstValues() default value",
+    )
+  }
+
+  @Test
+  fun unexpectedFunctionArgumentType() {
     val result = compile(
       sourceFile = SourceFile.kotlin(
         "CoffeeTest.kt",
diff --git a/burst-kotlin-plugin/src/main/kotlin/app/cash/burst/kotlin/BurstIrGenerationExtension.kt b/burst-kotlin-plugin/src/main/kotlin/app/cash/burst/kotlin/BurstIrGenerationExtension.kt
index 5fe872b..56ee81a 100644
--- a/burst-kotlin-plugin/src/main/kotlin/app/cash/burst/kotlin/BurstIrGenerationExtension.kt
+++ b/burst-kotlin-plugin/src/main/kotlin/app/cash/burst/kotlin/BurstIrGenerationExtension.kt
@@ -45,12 +45,16 @@ class BurstIrGenerationExtension(
         }
 
         if (classHasAtBurst && classDeclaration.modality != Modality.ABSTRACT) {
-          ClassSpecializer(
-            pluginContext = pluginContext,
-            burstApis = burstApis,
-            originalParent = currentFile,
-            original = classDeclaration,
-          ).generateSpecializations()
+          try {
+            ClassSpecializer(
+              pluginContext = pluginContext,
+              burstApis = burstApis,
+              originalParent = currentFile,
+              original = classDeclaration,
+            ).generateSpecializations()
+          } catch (e: BurstCompilationException) {
+            messageCollector.report(e.severity, e.message, currentFile.locationOf(e.element))
+          }
         }
 
         // Snapshot the original functions because the loop mutates them.