diff --git a/ktorm-ksp-compiler/src/main/kotlin/org/ktorm/ksp/compiler/parser/MetadataParser.kt b/ktorm-ksp-compiler/src/main/kotlin/org/ktorm/ksp/compiler/parser/MetadataParser.kt
index 920a2585..68fc353d 100644
--- a/ktorm-ksp-compiler/src/main/kotlin/org/ktorm/ksp/compiler/parser/MetadataParser.kt
+++ b/ktorm-ksp-compiler/src/main/kotlin/org/ktorm/ksp/compiler/parser/MetadataParser.kt
@@ -73,22 +73,25 @@ internal class MetadataParser(resolver: Resolver, environment: SymbolProcessorEn
     }
 
     fun parseTableMetadata(cls: KSClassDeclaration): TableMetadata {
-        val r = _tablesCache[cls.qualifiedName!!.asString()]
+        val className = cls.qualifiedName!!.asString()
+        val r = _tablesCache[className]
         if (r != null) {
             return r
         }
 
         if (cls.classKind != CLASS && cls.classKind != INTERFACE) {
-            val name = cls.qualifiedName!!.asString()
-            throw IllegalStateException("$name is expected to be a class or interface but actually ${cls.classKind}.")
+            throw IllegalStateException("$className should be a class or interface but actually ${cls.classKind}.")
         }
 
         if (cls.classKind == INTERFACE && !cls.isSubclassOf<Entity<*>>()) {
-            val name = cls.qualifiedName!!.asString()
-            throw IllegalStateException("$name must extend from org.ktorm.entity.Entity.")
+            throw IllegalStateException("$className must extend from org.ktorm.entity.Entity.")
         }
 
-        _logger.info("[ktorm-ksp-compiler] parse table metadata from entity: ${cls.qualifiedName!!.asString()}")
+        if (cls.classKind == CLASS && cls.isAbstract()) {
+            throw IllegalStateException("$className cannot be an abstract class.")
+        }
+
+        _logger.info("[ktorm-ksp-compiler] parse table metadata from entity: $className")
         val table = cls.getAnnotationsByType(Table::class).first()
         val tableDef = TableMetadata(
             entityClass = cls,
@@ -111,7 +114,7 @@ internal class MetadataParser(resolver: Resolver, environment: SymbolProcessorEn
             }
         }
 
-        _tablesCache[cls.qualifiedName!!.asString()] = tableDef
+        _tablesCache[className] = tableDef
         return tableDef
     }
 
diff --git a/ktorm-ksp-compiler/src/test/kotlin/org/ktorm/ksp/compiler/parser/MetadataParserTest.kt b/ktorm-ksp-compiler/src/test/kotlin/org/ktorm/ksp/compiler/parser/MetadataParserTest.kt
index 0f7c1e43..f57891cb 100644
--- a/ktorm-ksp-compiler/src/test/kotlin/org/ktorm/ksp/compiler/parser/MetadataParserTest.kt
+++ b/ktorm-ksp-compiler/src/test/kotlin/org/ktorm/ksp/compiler/parser/MetadataParserTest.kt
@@ -9,7 +9,7 @@ import org.ktorm.ksp.compiler.BaseKspTest
 class MetadataParserTest : BaseKspTest() {
 
     @Test
-    fun testEnumClass() = kspFailing("Gender is expected to be a class or interface but actually ENUM_CLASS.", """
+    fun testEnumClass() = kspFailing("Gender should be a class or interface but actually ENUM_CLASS.", """
         @Table
         enum class Gender { MALE, FEMALE }
     """.trimIndent())
@@ -23,6 +23,15 @@ class MetadataParserTest : BaseKspTest() {
         }
     """.trimIndent())
 
+    @Test
+    fun testAbstractClass() = kspFailing("User cannot be an abstract class.", """
+        @Table
+        abstract class User {
+            var id: Int = 0
+            var name: String = ""
+        }
+    """.trimIndent())
+
     @Test
     fun testClassIgnoreProperties() = runKotlin("""
         @Table(ignoreProperties = ["name"])