Update Branch-SDK/src/main/java/io/branch/referral/BranchConfigurationController.kt

Co-authored-by: matter-code-review[bot] <150888575+matter-code-review[bot]@users.noreply.github.com>

Author: wpinho-branch

Branch-SDK/src/main/java/io/branch/referral/BranchConfigurationController.kt

@@ -17,7 +17,9 @@ class BranchConfigurationController {
      * @see Branch.expectDelayedSessionInitialization
      */
     fun setDelayedSessionInitUsed(used: Boolean) {
-        Branch.getInstance().prefHelper_.delayedSessionInitUsed = used
+        Branch.getInstance()?.let { branch ->
+            branch.prefHelper_.delayedSessionInitUsed = used
+        }
     }
 
     /**