diff --git a/integration-tests/__tests__/data-duplicator.spec.js b/integration-tests/__tests__/data-duplicator.spec.js
index 7d5c532e5..81444830a 100644
--- a/integration-tests/__tests__/data-duplicator.spec.js
+++ b/integration-tests/__tests__/data-duplicator.spec.js
@@ -91,4 +91,65 @@ describe('Data duplicator', () => {
       expect(res2.rows[0].cnt.toString()).toEqual('6');
     })
   );
+
+  test.each(engines.filter(x => !x.skipDataDuplicator).map(engine => [engine.label, engine]))(
+    'Skip nullable weak refs - %s',
+    testWrapper(async (conn, driver, engine) => {
+      runCommandOnDriver(conn, driver, dmp =>
+        dmp.createTable({
+          pureName: 't1',
+          columns: [
+            { columnName: 'id', dataType: 'int', notNull: true },
+            { columnName: 'val', dataType: 'varchar(50)' },
+          ],
+          primaryKey: {
+            columns: [{ columnName: 'id' }],
+          },
+        })
+      );
+      runCommandOnDriver(conn, driver, dmp =>
+        dmp.createTable({
+          pureName: 't2',
+          columns: [
+            { columnName: 'id', dataType: 'int', autoIncrement: true, notNull: true },
+            { columnName: 'val', dataType: 'varchar(50)' },
+            { columnName: 'valfk', dataType: 'int', notNull: false },
+          ],
+          primaryKey: {
+            columns: [{ columnName: 'id' }],
+          },
+          foreignKeys: [{ refTableName: 't1', columns: [{ columnName: 'valfk', refColumnName: 'id' }] }],
+        })
+      );
+      runCommandOnDriver(conn, driver, dmp => dmp.put("insert into ~t1 (~id, ~val) ~values (1, 'first')"));
+
+      const gett2 = () =>
+        stream.Readable.from([
+          { __isStreamHeader: true, __isDynamicStructure: true },
+          { id: 1, val: 'v1', valfk: 1 },
+          { id: 2, val: 'v2', valfk: 2 },
+        ]);
+
+      await dataDuplicator({
+        systemConnection: conn,
+        driver,
+        items: [
+          {
+            name: 't2',
+            operation: 'copy',
+            openStream: gett2,
+          },
+        ],
+        options: {
+          setNullForUnresolvedNullableRefs: true,
+        },
+      });
+
+      const res1 = await driver.query(conn, `select count(*) as cnt from t1`);
+      expect(res1.rows[0].cnt.toString()).toEqual('1');
+
+      const res2 = await driver.query(conn, `select count(*) as cnt from t2`);
+      expect(res2.rows[0].cnt.toString()).toEqual('1');
+    })
+  );
 });
diff --git a/packages/datalib/src/DataDuplicator.ts b/packages/datalib/src/DataDuplicator.ts
index 421ada4ee..c2b4d6cce 100644
--- a/packages/datalib/src/DataDuplicator.ts
+++ b/packages/datalib/src/DataDuplicator.ts
@@ -21,6 +21,7 @@ export interface DataDuplicatorItem {
 export interface DataDuplicatorOptions {
   rollbackAfterFinish?: boolean;
   skipRowsWithUnresolvedRefs?: boolean;
+  setNullForUnresolvedNullableRefs?: boolean;
 }
 
 class DuplicatorReference {
@@ -36,9 +37,19 @@ class DuplicatorReference {
   }
 }
 
+class DuplicatorWeakReference {
+  constructor(public base: DuplicatorItemHolder, public ref: TableInfo, public foreignKey: ForeignKeyInfo) {}
+
+  get columnName() {
+    return this.foreignKey.columns[0].columnName;
+  }
+}
+
 class DuplicatorItemHolder {
   references: DuplicatorReference[] = [];
   backReferences: DuplicatorReference[] = [];
+  // not mandatory references to entities out of the model
+  weakReferences: DuplicatorWeakReference[] = [];
   table: TableInfo;
   isPlanned = false;
   idMap = {};
@@ -65,13 +76,19 @@ class DuplicatorItemHolder {
     for (const fk of this.table.foreignKeys) {
       if (fk.columns?.length != 1) continue;
       const refHolder = this.duplicator.itemHolders.find(y => y.name.toUpperCase() == fk.refTableName.toUpperCase());
-      if (refHolder == null) continue;
       const isMandatory = this.table.columns.find(x => x.columnName == fk.columns[0]?.columnName)?.notNull;
-      const newref = new DuplicatorReference(this, refHolder, isMandatory, fk);
-      this.references.push(newref);
-      this.refByColumn[newref.columnName] = newref;
+      if (refHolder == null) {
+        if (!isMandatory) {
+          const weakref = new DuplicatorWeakReference(this, this.duplicator.db.tables.find(x => x.pureName == fk.refTableName), fk);
+          this.weakReferences.push(weakref);
+        }
+      } else {
+        const newref = new DuplicatorReference(this, refHolder, isMandatory, fk);
+        this.references.push(newref);
+        this.refByColumn[newref.columnName] = newref;
 
-      refHolder.isReferenced = true;
+        refHolder.isReferenced = true;
+      }
     }
   }
 
diff --git a/packages/web/src/tabs/DataDuplicatorTab.svelte b/packages/web/src/tabs/DataDuplicatorTab.svelte
index 562eaa5ae..12259b825 100644
--- a/packages/web/src/tabs/DataDuplicatorTab.svelte
+++ b/packages/web/src/tabs/DataDuplicatorTab.svelte
@@ -286,6 +286,29 @@
               }}
             />
           </FormFieldTemplateLarge>
+
+          <FormFieldTemplateLarge
+            label="Set NULL for nullable unresolved references"
+            type="checkbox"
+            labelProps={{
+              onClick: () => {
+                setEditorData(old => ({
+                  ...old,
+                  setNullForUnresolvedNullableRefs: !$editorState.value?.setNullForUnresolvedNullableRefs,
+                }));
+              },
+            }}
+          >
+            <CheckboxField
+              checked={$editorState.value?.setNullForUnresolvedNullableRefs}
+              on:change={e => {
+                setEditorData(old => ({
+                  ...old,
+                  setNullForUnresolvedNullableRefs: e.target.checked,
+                }));
+              }}
+            />
+          </FormFieldTemplateLarge>
         </ObjectConfigurationControl>
 
         <ObjectConfigurationControl title="Imported files">