diff --git a/src/lib/a11y/focus.js b/src/lib/a11y/focus.js
index afc4f27..d33c548 100644
--- a/src/lib/a11y/focus.js
+++ b/src/lib/a11y/focus.js
@@ -5,10 +5,21 @@ import {
 } from "react-native";
 
 export function setA11yFocus(refOrNode) {
-  const node = findNodeHandle(refOrNode?.current ?? refOrNode);
-  if (!node) return;
-
-  AccessibilityInfo.setAccessibilityFocus(node);
+  // RN's `setAccessibilityFocus` expects a native host node handle.
+  // In practice, callers may pass:
+  // - a ref object ({ current })
+  // - a host component
+  // - a composite component instance (invalid)
+  // - null/undefined
+  // We must never throw here, otherwise we can crash the whole app.
+  try {
+    const candidate = refOrNode?.current ?? refOrNode;
+    const node = findNodeHandle(candidate);
+    if (typeof node !== "number") return;
+    AccessibilityInfo.setAccessibilityFocus(node);
+  } catch (_e) {
+    // noop
+  }
 }
 
 export function setA11yFocusAfterInteractions(refOrNode) {
diff --git a/src/scenes/AlertCurMap/index.js b/src/scenes/AlertCurMap/index.js
index 40232bb..9436b5a 100644
--- a/src/scenes/AlertCurMap/index.js
+++ b/src/scenes/AlertCurMap/index.js
@@ -505,7 +505,9 @@ function AlertCurMap() {
 
   const closeStepper = useCallback(() => {
     setStepperIsOpened(false);
-    setA11yFocusAfterInteractions(lastStepsTriggerRef.current);
+    // Pass the ref object (not `.current`) so `findNodeHandle` can safely
+    // resolve the native host view.
+    setA11yFocusAfterInteractions(lastStepsTriggerRef);
   }, [setStepperIsOpened]);
 
   const stepperOnOpen = useCallback(() => {
@@ -521,7 +523,7 @@ function AlertCurMap() {
       setStepperIsOpened(false);
     }
     announceForA11yIfScreenReaderEnabled("Liste des étapes fermée");
-    setA11yFocusAfterInteractions(lastStepsTriggerRef.current);
+    setA11yFocusAfterInteractions(lastStepsTriggerRef);
   }, [stepperIsOpened, setStepperIsOpened]);
 
   const [externalGeoIsVisible, setExternalGeoIsVisible] = useState(false);