Index: doc/API_web.md
==================================================================
--- doc/API_web.md
+++ doc/API_web.md
@@ -67,12 +67,12 @@
 If you have disabled the spinning button, you can launch the Grammalecte panel with your custom button.
 
     oGrammalecteAPI.openPanelForNode("node_id")
     oGrammalecteAPI.openPanelForNode(node)
 
-The node can be a textarea, an editable node or an iframe.
-If the node is an iframe, the content won’t be modified by Grammalecte.
+The node can be a textarea, an editable node or an iframe. **The node must have an identifier**.
+If the node is an iframe, the content won’t be modified by Grammalecte, but events with results may be received (see below).
 
 
 ### Prevent Grammalecte to modify the node content
 
 If you don’t want Grammalecte to modify directly the node content, add the property: `data-grammalecte_result_via_event="true"`.
@@ -93,19 +93,19 @@
 
     oGrammalecteAPI.openPanelForText("your text")
     oGrammalecteAPI.openPanelForText("your text", "node_id")
     oGrammalecteAPI.openPanelForText("your text", node)
 
-With the second parameter, Grammalecte will send an event to the node each times the text is modified within the panel.
+With the second parameter, Grammalecte will send an event to the node each times the text is modified within the panel. **The node must have an identifier**.
 
 
 ### Parse a node and get errors
 
     oGrammalecteAPI.parseNode("node_id")
     oGrammalecteAPI.parseNode(node)
 
-The node can be a textarea, an editable node or an iframe. The node must have an identifier.
+The node can be a textarea, an editable node or an iframe. **The node must have an identifier**.
 Results (for each paragraph) will be sent in a succession of events at the node.
 
     node.addEventListener("GrammalecteResult", function (event) {
         const detail = (typeof(event.detail) === 'string') && JSON.parse(event.detail);
         if (detail.sType  &&  detail.sType == "proofreading") {
@@ -120,12 +120,12 @@
 ### Parse text and get errors
 
     oGrammalecteAPI.parseText("your text", "node_id")
     oGrammalecteAPI.parseText("your text", node)
 
-The node must have an identifier.
 Like with `oGrammalecteAPI.parseNode()`, results (for each paragraph) will be sent in a succession of events at the node.
+**The node must have an identifier**.
 
 
 
 ### Get spelling suggestions
 

Index: gc_lang/fr/webext/content_scripts/api.js
==================================================================
--- gc_lang/fr/webext/content_scripts/api.js
+++ gc_lang/fr/webext/content_scripts/api.js
@@ -32,10 +32,13 @@
                 sNodeId = vNode.id;
             }
             else if (typeof(vNode) === "string" && document.getElementById(vNode)) {
                 sNodeId = vNode;
             }
+            else {
+                console.log("[Grammalecte API] No node identifier. No event, no result will be sent.")
+            }
             let xEvent = new CustomEvent("GrammalecteCall", { detail: JSON.stringify({sCommand: "openPanelForText", sText: sText, sNodeId: sNodeId}) });
             document.dispatchEvent(xEvent);
         } else {
             console.log("[Grammalecte API] Error: parameter is not a text.");
         }