diff --git a/poincare/src/symbol_abstract.cpp b/poincare/src/symbol_abstract.cpp
index c7758717a..be598f97b 100644
--- a/poincare/src/symbol_abstract.cpp
+++ b/poincare/src/symbol_abstract.cpp
@@ -73,11 +73,7 @@ Expression SymbolAbstract::Expand(const SymbolAbstract & symbol, Context * conte
   {
     return clone ? symbol.clone() : *const_cast<SymbolAbstract *>(&symbol);
   }
-  if (context == nullptr) {
-    // A context is required
-    assert(false);
-    return Undefined::Builder();
-  }
+  assert(context);
   Expression e = context->expressionForSymbolAbstract(symbol, clone);
   /* Replace all the symbols iteratively. This prevents a memory failure when
    * symbols are defined circularly. */