diff --git a/PULL_REQUEST_TEMPLATE.md b/PULL_REQUEST_TEMPLATE.md
new file mode 100755
index 000000000..57ca1bacc
--- /dev/null
+++ b/PULL_REQUEST_TEMPLATE.md
@@ -0,0 +1,33 @@
+---
+name: Pull Request
+about: Create a pull request to help improve the extension
+title: 'fix: prevent double-sending rolls to Roll20 when no campaign limit is set'
+labels: pr
+assignees: ''
+---
+
+## Summary
+Fixes a double-roll bug where Roll20 tabs received each roll message twice when no specific VTT campaign limit was configured.
+
+## Type of change
+- [x] 🐛 Bug fix (non-breaking change that fixes an issue)
+
+## ⚠️ AI usage disclosure (required)
+- [x] I **did** use AI for this PR (describe below).
+
+AI-assisted in identifying the root cause by comparing old and new versions of background.js.
+
+## Motivation & context
+When `settings["vtt-tab"]` is null (no specific campaign configured), `sendMessageToRoll20` entered the `else` branch which sent the roll message via `sendMessageTo(ROLL20_URL, ...)` and then looped through all tracked `roll20_tabs` separately. Any Roll20 tab that matched the URL query AND was tracked in `roll20_tabs` received the message twice, causing double roll output in Roll20.
+
+## What changed?
+- `src/extension/background.js`: In the `else` branch of `sendMessageToRoll20`, replaced the separate URL query send + tracked tabs loop with a single query that merges `roll20_tabs` into the URL-matched results (deduplicating by tab id) before sending, matching the pattern used in the `if (limit)` branch.
+
+## How to test
+1. Configure Beyond20 with no specific VTT campaign limit (vtt-tab is null)
+2. Open a Roll20 game
+3. Make a roll from D&D Beyond
+4. Observe that only one chat message appears in Roll20 (previously two appeared)
+
+## Reviewer notes
+The `roll20_tabs` tracking was added to support the no-trailing-slash Roll20 URL variant, but the `else` branch didn't account for overlap between URL query results and tracked tabs. The fix uses the same merge-before-send pattern already used in the `if (limit)` branch above.
diff --git a/src/roll20/page-script.js b/src/roll20/page-script.js
index c12c05acc..c69a9308a 100644
--- a/src/roll20/page-script.js
+++ b/src/roll20/page-script.js
@@ -25,9 +25,13 @@ async function updateHP(name, current, total, temp) {
         D&D 5E 2014                           | ogl5e
         D&D 5e (New!) - 2024 / 2014           | dnd2024byroll20
         D&D 5E (Community Contributed)        | dnd5e
+
+        Legacy Games do not have characterSheet set at all, so need fallback to 2014 sheets if window.vttEngine === "legacy" and character.characterSheet is undefined.
+
+        We will default to 2014 sheets prior to 2024 sheet support being added.
      */
 
-    if (character.characterSheet?.shortName === "ogl5e" || character.characterSheet?.shortName === "dnd5e") { // 2014 sheet versions
+    if (window.vttEngine === "legacy" || (character.characterSheet?.shortName === "ogl5e" || character.characterSheet?.shortName === "dnd5e")) { // 2014 sheet versions
         const hp = character.attribs.find((a) => a.attributes.name === "hp");
         if (hp) {
             //console.log("Found attribute : ", hp);