diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/revplot/PlotWalk.java b/org.eclipse.jgit/src/org/eclipse/jgit/revplot/PlotWalk.java
index 8323d2fe2..55cf235cf 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/revplot/PlotWalk.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/revplot/PlotWalk.java
@@ -172,6 +172,11 @@ long timeof(RevObject o) {
 				return ((RevCommit) o).getCommitTime();
 			if (o instanceof RevTag) {
 				RevTag tag = (RevTag) o;
+				try {
+					parseBody(tag);
+				} catch (IOException e) {
+					return 0;
+				}
 				PersonIdent who = tag.getTaggerIdent();
 				return who != null ? who.getWhen().getTime() : 0;
 			}