--- a/receiver/recplayer.cpp
+++ b/receiver/recplayer.cpp
@@ -97,13 +97,14 @@ int cRecordingPlayer::seek(off_t offset,
     }
     // finally, we can seek
     // TODO: binary search
-    for(index = 1; this->mLastOffsets[index]; index++){
+    for(index = 1; index <= this->mLastFileNumber; index++){
         if(this->mLastOffsets[index-1] <= offset && offset <= this->mLastOffsets[index]){
             relativeOffset = offset - this->mLastOffsets[index-1];
             break;
         }
     }
-    if(!(this->mCurrentFile = this->mRecordingFile->SetOffset(index, relativeOffset))){
+    if(index > this->mLastFileNumber ||
+        !(this->mCurrentFile = this->mRecordingFile->SetOffset(index, relativeOffset))){
         // seeking failed!!! should never happen.
         this->mCurrentFile = this->mRecordingFile->SetOffset(1);
         return -1;
@@ -115,9 +116,12 @@ int cRecordingPlayer::seek(off_t offset,
 void cRecordingPlayer::scanLastOffsets(){
     // rewind
     this->mCurrentFile = this->mRecordingFile->SetOffset(1);
-    for(int i = 1; (this->mCurrentFile = this->mRecordingFile->NextFile()); i++){
+    this->mLastOffsets[0] = 0;
+    this->mLastFileNumber = 1;
+    for(int i = 1; this->mCurrentFile; i++){
         this->mLastOffsets[i] = this->mLastOffsets[i-1] + this->mCurrentFile->Seek(0, SEEK_END);
         this->mLastFileNumber = this->mRecordingFile->Number();
+        this->mCurrentFile = this->mRecordingFile->NextFile();
     }
 }