diff --git a/chrome/android/java/src/org/chromium/chrome/browser/customtabs/CustomTabsConnection.java b/chrome/android/java/src/org/chromium/chrome/browser/customtabs/CustomTabsConnection.java
index b5c90862d2bc6..2412a26740c7f 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/customtabs/CustomTabsConnection.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/customtabs/CustomTabsConnection.java
@@ -319,6 +319,9 @@ public boolean mayLaunchUrl(ICustomTabsCallback callback, Uri url, final Bundle
         if (scheme != null && !scheme.equals("http") && !scheme.equals("https")) return false;
         if (!isCallerForegroundOrSelf()) return false;
 
+        // Things below need the browser process to be initialized.
+        if (!warmup(0)) return false;
+
         final IBinder session = callback.asBinder();
         final String urlString = url.toString();
         final boolean noPrerendering =