diff --git a/src/interpreter/runtimeModel.ts b/src/interpreter/runtimeModel.ts
index 7b07dba4..640d7c7f 100644
--- a/src/interpreter/runtimeModel.ts
+++ b/src/interpreter/runtimeModel.ts
@@ -2,7 +2,7 @@ import { WOLLOK_BASE_PACKAGE, WOLLOK_EXTRA_STACK_TRACE_HEADER } from '../constan
 import { v4 as uuid } from 'uuid'
 import { getPotentiallyUninitializedLazy } from '../decorators'
 import { get, is, last, List, match, raise, when } from '../extensions'
-import { Assignment, Body, Catch, Describe, Environment, Entity, Expression, Id, If, Literal, LiteralValue, Method, Module, Name, New, Node, Package, Program, Reference, Return, Self, Send, Singleton, Super, Test, Throw, Try, Variable } from '../model'
+import { Assignment, Body, Catch, Describe, Environment, Entity, Expression, Id, If, Literal, LiteralValue, Method, Module, Name, New, Node, Package, Program, Reference, Return, Self, Send, Singleton, Super, Test, Throw, Try, Variable, Class } from '../model'
 import { Interpreter } from './interpreter'
 
 const { isArray } = Array
@@ -488,6 +488,12 @@ export class Evaluation {
 
     const target = node.instantiated.target ?? raise(new Error(`Could not resolve reference to instantiated module ${node.instantiated.name}`))
 
+    const name = node.instantiated.name
+    
+    if (!target.is(Class)) raise(new Error(`${name} is not a class, you cannot generate instances of a ${target?.kind}`))
+
+    if (target.isAbstract) raise(new Error(`${name} is an abstract class, you cannot generate instances`))
+
     return yield* this.instantiate(target, args)
   }