Index: src/bp-groups/bp-groups-activity.php
===================================================================
--- src/bp-groups/bp-groups-activity.php
+++ src/bp-groups/bp-groups-activity.php
@@ -392,7 +392,7 @@
 
 	// If current user is not a group member or is banned, user cannot comment.
 	if ( ! bp_current_user_can( 'bp_moderate' ) &&
-		( ! groups_is_user_member( bp_loggedin_user_id(), $group_id ) || ! groups_is_user_banned( bp_loggedin_user_id(), $group_id ) )
+		( ! groups_is_user_member( bp_loggedin_user_id(), $group_id ) || groups_is_user_banned( bp_loggedin_user_id(), $group_id ) )
 	) {
 		$retval = false;
 	}
Index: tests/phpunit/testcases/groups/activity.php
===================================================================
--- tests/phpunit/testcases/groups/activity.php
+++ tests/phpunit/testcases/groups/activity.php
@@ -223,4 +223,43 @@
 
 		$this->set_current_user( $old_user );
 	}
+
+	/**
+	 * @group bp_activity_can_comment
+	 */
+	public function test_groups_activity_can_comment() {
+		$old_user = get_current_user_id();
+		$u1 = self::factory()->user->create();
+		$u2 = self::factory()->user->create();
+
+		$g = self::factory()->group->create();
+
+		// User 1 is a group member, while user 2 isn't.
+		groups_join_group( $g, $u1 );
+
+		$a = self::factory()->activity->create( array(
+			'component' => buddypress()->groups->id,
+			'type' => 'created_group',
+			'user_id' => $u1,
+			'item_id' => $g,
+		) );
+
+		$this->set_current_user( $u1 );
+		if ( bp_has_activities( array( 'in' => $a ) ) ) {
+			while ( bp_activities() ) : bp_the_activity();
+				// User 1 should be able to comment.
+				$this->assertTrue( bp_activity_can_comment() );
+			endwhile;
+		}
+
+		$this->set_current_user( $u2 );
+		if ( bp_has_activities( array( 'in' => $a ) ) ) {
+			while ( bp_activities() ) : bp_the_activity();
+				// User 2 should not be able to comment.
+				$this->assertFalse( bp_activity_can_comment() );
+			endwhile;
+		}
+
+		$this->set_current_user( $old_user );
+	}
 }