diff --git a/engine/src/main/java/org/archive/crawler/reporting/HostsReport.java b/engine/src/main/java/org/archive/crawler/reporting/HostsReport.java
index 9ffedde4..c8a509e7 100644
--- a/engine/src/main/java/org/archive/crawler/reporting/HostsReport.java
+++ b/engine/src/main/java/org/archive/crawler/reporting/HostsReport.java
@@ -76,6 +76,10 @@ public class HostsReport extends Report {
 	
 	@Override
     public void write(final PrintWriter writer, StatisticsTracker stats) {
+            if (!stats.bdb.isRunning()) {
+                writer.println("bdb not started");
+                return;
+            }
     	Collection<String> keys = null;
     	DisposableStoredSortedMap<Long, String> hd = null;
     	if (maxSortSize<0 || maxSortSize>stats.serverCache.hostKeys().size()) {
diff --git a/engine/src/main/java/org/archive/crawler/reporting/MimetypesReport.java b/engine/src/main/java/org/archive/crawler/reporting/MimetypesReport.java
index 7bb2c970..56615eea 100644
--- a/engine/src/main/java/org/archive/crawler/reporting/MimetypesReport.java
+++ b/engine/src/main/java/org/archive/crawler/reporting/MimetypesReport.java
@@ -33,6 +33,10 @@ public class MimetypesReport extends Report {
 
     @Override
     public void write(PrintWriter writer, StatisticsTracker stats) {
+        if (!stats.bdb.isRunning()) {
+            writer.println("bdb not started");
+            return;
+        }
         // header
         writer.print("[#urls] [#bytes] [mime-types]\n");
         DisposableStoredSortedMap<Long,String> fd = stats.getReverseSortedCopy(stats.getFileDistribution());
diff --git a/engine/src/main/java/org/archive/crawler/reporting/ResponseCodeReport.java b/engine/src/main/java/org/archive/crawler/reporting/ResponseCodeReport.java
index 0bd24fb8..35971885 100644
--- a/engine/src/main/java/org/archive/crawler/reporting/ResponseCodeReport.java
+++ b/engine/src/main/java/org/archive/crawler/reporting/ResponseCodeReport.java
@@ -32,6 +32,10 @@ public class ResponseCodeReport extends Report {
 
     @Override
     public void write(PrintWriter writer, StatisticsTracker stats) {
+        if (!stats.bdb.isRunning()) {
+            writer.println("bdb not started");
+            return;
+        }
         // header
         writer.print("[#urls] [rescode]\n");
         
diff --git a/engine/src/main/java/org/archive/crawler/reporting/SeedsReport.java b/engine/src/main/java/org/archive/crawler/reporting/SeedsReport.java
index 645bcc69..103c5e3d 100644
--- a/engine/src/main/java/org/archive/crawler/reporting/SeedsReport.java
+++ b/engine/src/main/java/org/archive/crawler/reporting/SeedsReport.java
@@ -36,6 +36,11 @@ public class SeedsReport extends Report {
 
     @Override
     public void write(PrintWriter writer, StatisticsTracker stats) {
+        if (!stats.bdb.isRunning()) {
+            writer.println("bdb not started");
+            return;
+        }
+
         // Build header.
         writer.print("[code] [status] [seed] [redirect]\n");