diff --git a/.last-branch b/.last-branch
index 35b4fcd..19347a4 100644
--- a/.last-branch
+++ b/.last-branch
@@ -1 +1 @@
-v20260104-06-reports-html-jobs-summary-success-rate
+v20260104-07-reports-html-export-fix-json
diff --git a/containers/backupchecks/src/backend/app/main/routes_reporting_api.py b/containers/backupchecks/src/backend/app/main/routes_reporting_api.py
index 0bd8f21..b637ab2 100644
--- a/containers/backupchecks/src/backend/app/main/routes_reporting_api.py
+++ b/containers/backupchecks/src/backend/app/main/routes_reporting_api.py
@@ -1392,8 +1392,8 @@ def _export_html_response(report: ReportDefinition, report_id: int, view: str):
     </div>
     <script>
       (function() {{
-        const labels = {_json.dumps(job_labels)};
-        const data = {_json.dumps(job_rates)};
+        const labels = {json.dumps(job_labels)};
+        const data = {json.dumps(job_rates)};
         const ctx = document.getElementById('jobSuccessRateChart');
         if (!ctx) return;
         new Chart(ctx, {{
@@ -1638,8 +1638,8 @@ def _export_html_response(report: ReportDefinition, report_id: int, view: str):
   </div>
 
 <script>
-  const trends = {_json.dumps(trends)};
-  const dist = {_json.dumps(status_dist)};
+  const trends = {json.dumps(trends)};
+  const dist = {json.dumps(status_dist)};
   const labels = trends.map(t => t.day);
   const rates = trends.map(t => t.success_rate);
 
diff --git a/docs/changelog.md b/docs/changelog.md
index 87047b1..4fe87dd 100644
--- a/docs/changelog.md
+++ b/docs/changelog.md
@@ -238,6 +238,16 @@
 - Added a **per-job success rate chart** to the HTML report to visualize backup performance per job.
 - Prevented job status from being presented as a summary value, as it represents a momentary state rather than a stable metric.
 
+---
+
+## v20260104-07-reports-html-export-fix-json
+
+### Fixed
+- Resolved Internal Server Error when downloading HTML reports.
+- Fixed an `UnboundLocalError` caused by an uninitialized `_json` variable in the HTML export response.
+- Replaced usage of `_json` with a consistent `json.dumps(...)` call using the top-level JSON import.
+- Ensured stable HTML report export handling across all report download actions.
+
 ================================================================================================================================================
 
 ## v0.1.15