Index: includes/api/ApiQuery.php
===================================================================
--- includes/api/ApiQuery.php	(revision 75547)
+++ includes/api/ApiQuery.php	(working copy)
@@ -457,35 +457,45 @@
 			$result->addValue( 'query', 'pages', $pages );
 		}
 		if ( $this->params['export'] ) {
-			$exporter = new WikiExporter( $this->getDB() );
-			// WikiExporter writes to stdout, so catch its
-			// output with an ob
-			ob_start();
-			$exporter->openStream();
-			foreach ( $pageSet->getGoodTitles() as $title ) {
-				if ( $title->userCanRead() ) {
+			$exportTitles = array();
+			$titles = $pageSet->getGoodTitles();
+			if( count( $titles ) ) {
+				foreach ( $titles as $title ) {
+					if ( $title->userCanRead() ) {
+						$exportTitles[] = $title;
+					}
+				}
+			}
+			//export, when there are titles
+			if( count( $exportTitles ) ) {
+				$exporter = new WikiExporter( $this->getDB() );
+				// WikiExporter writes to stdout, so catch its
+				// output with an ob
+				ob_start();
+				$exporter->openStream();
+				foreach ( $exportTitles as $title ) {
 					$exporter->pageByTitle( $title );
 				}
+				$exporter->closeStream();
+				$exportxml = ob_get_contents();
+				ob_end_clean();
+				
+				// Don't check the size of exported stuff
+				// It's not continuable, so it would cause more
+				// problems than it'd solve
+				$result->disableSizeCheck();
+				if ( $this->params['exportnowrap'] ) {
+					$result->reset();
+					// Raw formatter will handle this
+					$result->addValue( null, 'text', $exportxml );
+					$result->addValue( null, 'mime', 'text/xml' );
+				} else {
+					$r = array();
+					ApiResult::setContent( $r, $exportxml );
+					$result->addValue( 'query', 'export', $r );
+				}
+				$result->enableSizeCheck();
 			}
-			$exporter->closeStream();
-			$exportxml = ob_get_contents();
-			ob_end_clean();
-
-			// Don't check the size of exported stuff
-			// It's not continuable, so it would cause more
-			// problems than it'd solve
-			$result->disableSizeCheck();
-			if ( $this->params['exportnowrap'] ) {
-				$result->reset();
-				// Raw formatter will handle this
-				$result->addValue( null, 'text', $exportxml );
-				$result->addValue( null, 'mime', 'text/xml' );
-			} else {
-				$r = array();
-				ApiResult::setContent( $r, $exportxml );
-				$result->addValue( 'query', 'export', $r );
-			}
-			$result->enableSizeCheck();
 		}
 	}