diff --git a/Userland/Libraries/LibJS/Runtime/StringConstructor.cpp b/Userland/Libraries/LibJS/Runtime/StringConstructor.cpp
index a633074abe..5391e1c552 100644
--- a/Userland/Libraries/LibJS/Runtime/StringConstructor.cpp
+++ b/Userland/Libraries/LibJS/Runtime/StringConstructor.cpp
@@ -63,7 +63,7 @@ ThrowCompletionOr<NonnullGCPtr<Object>> StringConstructor::construct(FunctionObj
     else
         primitive_string = TRY(vm.argument(0).to_primitive_string(vm));
     auto* prototype = TRY(get_prototype_from_constructor(vm, new_target, &Intrinsics::string_prototype));
-    return StringObject::create(realm, *primitive_string, *prototype);
+    return MUST_OR_THROW_OOM(StringObject::create(realm, *primitive_string, *prototype));
 }
 
 // 22.1.2.4 String.raw ( template, ...substitutions ), https://tc39.es/ecma262/#sec-string.raw
diff --git a/Userland/Libraries/LibJS/Runtime/StringObject.cpp b/Userland/Libraries/LibJS/Runtime/StringObject.cpp
index 9205d6b679..e6e12a1a85 100644
--- a/Userland/Libraries/LibJS/Runtime/StringObject.cpp
+++ b/Userland/Libraries/LibJS/Runtime/StringObject.cpp
@@ -15,9 +15,9 @@
 namespace JS {
 
 // 10.4.3.4 StringCreate ( value, prototype ), https://tc39.es/ecma262/#sec-stringcreate
-NonnullGCPtr<StringObject> StringObject::create(Realm& realm, PrimitiveString& primitive_string, Object& prototype)
+ThrowCompletionOr<NonnullGCPtr<StringObject>> StringObject::create(Realm& realm, PrimitiveString& primitive_string, Object& prototype)
 {
-    return realm.heap().allocate<StringObject>(realm, primitive_string, prototype).release_allocated_value_but_fixme_should_propagate_errors();
+    return MUST_OR_THROW_OOM(realm.heap().allocate<StringObject>(realm, primitive_string, prototype));
 }
 
 StringObject::StringObject(PrimitiveString& string, Object& prototype)
@@ -31,8 +31,7 @@ ThrowCompletionOr<void> StringObject::initialize(Realm& realm)
     auto& vm = this->vm();
     MUST_OR_THROW_OOM(Base::initialize(realm));
 
-    // FIXME: Propagate this error.
-    define_direct_property(vm.names.length, Value(MUST(m_string.utf16_string_view()).length_in_code_units()), 0);
+    define_direct_property(vm.names.length, Value(MUST_OR_THROW_OOM(m_string.utf16_string_view()).length_in_code_units()), 0);
 
     return {};
 }
diff --git a/Userland/Libraries/LibJS/Runtime/StringObject.h b/Userland/Libraries/LibJS/Runtime/StringObject.h
index 8c65cc61e1..a31e629ff4 100644
--- a/Userland/Libraries/LibJS/Runtime/StringObject.h
+++ b/Userland/Libraries/LibJS/Runtime/StringObject.h
@@ -14,7 +14,7 @@ class StringObject : public Object {
     JS_OBJECT(StringObject, Object);
 
 public:
-    static NonnullGCPtr<StringObject> create(Realm&, PrimitiveString&, Object& prototype);
+    static ThrowCompletionOr<NonnullGCPtr<StringObject>> create(Realm&, PrimitiveString&, Object& prototype);
 
     virtual ThrowCompletionOr<void> initialize(Realm&) override;
     virtual ~StringObject() override = default;
diff --git a/Userland/Libraries/LibJS/Runtime/Value.cpp b/Userland/Libraries/LibJS/Runtime/Value.cpp
index bd8ec378c4..2ded93f26a 100644
--- a/Userland/Libraries/LibJS/Runtime/Value.cpp
+++ b/Userland/Libraries/LibJS/Runtime/Value.cpp
@@ -566,7 +566,7 @@ ThrowCompletionOr<Object*> Value::to_object(VM& vm) const
     // String
     case STRING_TAG:
         // Return a new String object whose [[StringData]] internal slot is set to argument. See 22.1 for a description of String objects.
-        return StringObject::create(realm, const_cast<JS::PrimitiveString&>(as_string()), *realm.intrinsics().string_prototype()).ptr();
+        return MUST_OR_THROW_OOM(StringObject::create(realm, const_cast<JS::PrimitiveString&>(as_string()), *realm.intrinsics().string_prototype())).ptr();
     // Symbol
     case SYMBOL_TAG:
         // Return a new Symbol object whose [[SymbolData]] internal slot is set to argument. See 20.4 for a description of Symbol objects.