diff --git a/modules/configuration/jsx/DiagnosisEvolution.js b/modules/configuration/jsx/DiagnosisEvolution.js
index 4b346ede6e..0cc27c6738 100644
--- a/modules/configuration/jsx/DiagnosisEvolution.js
+++ b/modules/configuration/jsx/DiagnosisEvolution.js
@@ -191,7 +191,8 @@ class DiagnosisEvolution extends Component {
                 label={t('Project', {ns: 'loris', count: 1})}
                 options={this.state.formData.projects}
                 onUserInput={this.setFormData}
-                value={JSON.stringify(trajectoryData.ProjectID)}
+                value={trajectoryData.ProjectID === null ?
+                  null : JSON.stringify(trajectoryData.ProjectID)}
                 required={true}
                 errorMessage={errorMessage.ProjectID}
               />