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Exec writes an import-mapping microflow with a null entity and the .mpr can no longer be loaded #1418
Description
Environment
- mxcli: v0.26.0 (release binary, 2026-10-11)
- Mendix app seen on: GenAI Showcase (mendix/genai-showcase-app) 11.12.0
- OS: Linux x86_64 cloud container (no Studio Pro;
mx/mxbuild only)
Summary
Exec writes an import-mapping microflow with a null entity and the .mpr can no longer be loaded. Command / document type: exec (microflow with import from mapping). Seen on: genai-showcase-app (Embeddings_SemanticSearch). — occurrences: 1
Reproduction
Blank 11.13.0 app, script u22.mdl (the microflow is created before the import mapping it calls, in one script):
mdl 1;
create module ModA;
create persistent entity ModA.EntA (Name: string(200));
create microflow ModA.MF_A ($Json: String) returns nothing
begin
$Items = import from mapping ModA.IM_A($Json);
end;
create json structure ModA.JS_A sample '[{"Name":"x"}]';
create import mapping ModA.IM_A with json structure ModA.JS_A { create ModA.EntA { Name = Name } };
$ mxcli -p A/A.mpr check u22.mdl
Check passed!
$ mxcli -p A/A.mpr exec u22.mdl
Created module: ModA
Created entity: ModA.EntA
Created microflow: ModA.MF_A
Created json structure: ModA.JS_A
Created import mapping ModA.IM_A
$ mx check A/A.mpr
ERROR: System.AggregateException: One or more errors occurred. (An error occurred when trying to set the 'Entity' property of a Object type in a Microflow with ID d3c06281-...)
---> System.InvalidOperationException: An error occurred when trying to set the 'Entity' property of a Object type in a Microflow with ID d3c06281-...
---> System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation.
---> System.ArgumentNullException: Value cannot be null. (Parameter 'value')
at Mendix.Modeler.DataTypes.EntityType.set_EntityId(EntityIdentifier value) in Mendix.Modeler.Core\DataTypes\EntityType.Generated.cs:line 36
The project cannot be loaded by mx afterwards. Re-running create or modify microflow with the same text only says Unchanged microflow: ModA.MF_A. Running drop microflow ModA.MF_A; and create microflow ModA.MF_A ... in one script once the mapping exists gives mx check 0 errors.
With the mapping missing altogether (no create import mapping in the script), check -p and exec refuse with a reference error, so only the forward reference inside one script gets through.
Expected
Either the forward reference to ModA.IM_A is refused, or the microflow is written with the mapping's entity once the mapping exists. An unloadable project must never result.
Actual
check and exec accept the script. The microflow is stored with a null entity for the import activity and mx check aborts with ArgumentNullException ... EntityType.set_EntityId, so the .mpr can no longer be checked or opened.
Impact
blocks round-trip, 1 occurrence(s) in the 2026-10-12 round-trip runs.
Activity
github-actions commentedon Oct 12, 2026
Issue Triage
Summary:
The issue describes a bug where
mxcli execcreates a microflow that references an import mapping before the mapping is defined, resulting in a microflow with a null entity and an unloadable.mprfile.Checklist (bug report requirements)
v0.26.0 (release binary, 2026-10-11)GenAI Showcase app 11.12.0u22.mdlrun withmxcli execto create a microflow that imports from a mappingmx checkfails withArgumentNullException: Value cannot be null. (Parameter 'value')inEntityType.set_EntityId; the.mprcannot be loadedmxcli diag --bundleor session log)Missing information:
Please provide the output of
mxcli diag --bundle(or at least the relevant session log) so we can investigate the internal state that led to the null entity.Thank you for reporting the issue! Once the diagnostic log is added, we’ll be able to proceed with a fix.
Automated triage via OpenRouter — workflow source
Merge pull request #1157 from ako/fix/1418-import-mapping-null-entity
fix: refuse import from mapping without a result entity (#1418)
fix: refuse change and member paths over a list retrieve (#1422)
Merge pull request #1418 from ako/fix/1531-call-workflow-parameter-ma…
Merge origin/main into fix/1529-workflow-expression-scope