Division by zero error in exif function

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[VividViews]

SMF Error Log:

http://burningsky.org/index.php?action=gallery;sa=view&id=38
2: Division by zero
File: /home/bsky/public_html/Sources/Gallery2.php
Line: 10493

Line 10493 is in BOLD below

function exif_get_focal_length($FNumber,$FocalLength)
{
         $Fnumber = explode("/", $FNumber);
    $Fnumber = $Fnumber[0] / $Fnumber[1];
     $Focal = explode("/", $FocalLength);
     $Focal = $Focal[0] / $Focal[1];

     return round($Focal)."mm";
}

EXIF data shown for the image in question:

Code:

Exif data
ImageDescription OLYMPUS DIGITAL CAMERA
Date Taken June 14, 2002, 12:50 pm
Model C900Z,D400Z
Focal Length 6mm
ISO Speed 100
Make OLYMPUS OPTICAL CO.,LTD
DateTime 2002:06:14 13:13:33
ExposureBiasValue 0/10
MeteringMode 5

[SMFHacks]

Added a check to next release to return n/a if dividing by zero.

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