Error message...

Developing in my local Win10 test environment, Wampserver 3.0.8 and Joomla 3.6.5 and Sige 3.2.3 I get the following error message on a page with ~50 SIGE thumbnails from ~25 directories and 3 normal pictures of approx 500kB in size. Error occur on both Edge, Chrome and IE. Any idea?

Notice: Undefined offset: 1 in C:\wamp\www\mb219dev\plugins\content\sige\sige.php on line 1455
Call Stack
# Time Memory Function Location
1 0.0007 135896 {main}( ) ...\index.php:0
2 0.1162 2750776 JApplicationCms->execute( ) ...\index.php:49
3 0.1162 2750880 JApplicationSite->doExecute( ) ...\cms.php:261
4 0.2367 5555376 JApplicationSite->dispatch( ) ...\site.php:230
5 0.2510 5812872 JComponentHelper::renderComponent( ) ...\site.php:191
6 0.2543 5828840 JComponentHelper::executeComponent( ) ...\helper.php:380
7 0.2552 5855480 require_once( 'C:\wamp\www\mb219dev\components\com_content\content.php' ) ...\helper.php:405
8 0.2624 6054816 JControllerLegacy->execute( ) ...\content.php:38
9 0.2624 6054952 ContentController->display( ) ...\legacy.php:702
10 0.3610 7169976 JControllerLegacy->display( ) ...\controller.php:113
11 0.3678 7313312 ContentViewArticle->display( ) ...\legacy.php:664
12 0.4494 8561240 JEventDispatcher->trigger( ) ...\view.html.php:161
13 0.4494 8561768 JEvent->update( ) ...\dispatcher.php:159
14 0.4494 8562272 call_user_func_array:{C:\wamp\www\mb219dev\libraries\joomla\event\event.php:69} ( ) ...\event.php:69
15 0.4494 8562536 PlgContentSige->onContentPrepare( ) ...\event.php:69
16 0.4851 8632080 PlgContentSige->createHtmlOutput( ) ...\sige.php:108
17 0.5020 8635032 PlgContentSige->htmlImage( ) ...\sige.php:324
18 0.5020 8635288 PlgContentSige->htmlImageFileInfo( ) ...\sige.php:1353

( ! ) Notice: Undefined offset: 1 in C:\wamp\www\mb219dev\plugins\content\sige\sige.php on line 1455
Call Stack
# Time Memory Function Location
1 0.0007 135896 {main}( ) ...\index.php:0
2 0.1162 2750776 JApplicationCms->execute( ) ...\index.php:49
3 0.1162 2750880 JApplicationSite->doExecute( ) ...\cms.php:261
4 0.2367 5555376 JApplicationSite->dispatch( ) ...\site.php:230
5 0.2510 5812872 JComponentHelper::renderComponent( ) ...\site.php:191
6 0.2543 5828840 JComponentHelper::executeComponent( ) ...\helper.php:380
7 0.2552 5855480 require_once( 'C:\wamp\www\mb219dev\components\com_content\content.php' ) ...\helper.php:405
8 0.2624 6054816 JControllerLegacy->execute( ) ...\content.php:38
9 0.2624 6054952 ContentController->display( ) ...\legacy.php:702
10 0.3610 7169976 JControllerLegacy->display( ) ...\controller.php:113
11 0.3678 7313312 ContentViewArticle->display( ) ...\legacy.php:664
12 0.4494 8561240 JEventDispatcher->trigger( ) ...\view.html.php:161
13 0.4494 8561768 JEvent->update( ) ...\dispatcher.php:159
14 0.4494 8562272 call_user_func_array:{C:\wamp\www\mb219dev\libraries\joomla\event\event.php:69} ( ) ...\event.php:69
15 0.4494 8562536 PlgContentSige->onContentPrepare( ) ...\event.php:69
16 0.4851 8632080 PlgContentSige->createHtmlOutput( ) ...\sige.php:108
17 0.5216 8635472 PlgContentSige->htmlImage( ) ...\sige.php:324
18 0.5216 8635728 PlgContentSige->htmlImageFileInfo( ) ...\sige.php:1353

( ! ) Notice: Undefined offset: 1 in C:\wamp\www\mb219dev\plugins\content\sige\sige.php on line 1455
Call Stack
# Time Memory Function Location
1 0.0007 135896 {main}( ) ...\index.php:0
2 0.1162 2750776 JApplicationCms->execute( ) ...\index.php:49
3 0.1162 2750880 JApplicationSite->doExecute( ) ...\cms.php:261
4 0.2367 5555376 JApplicationSite->dispatch( ) ...\site.php:230
5 0.2510 5812872 JComponentHelper::renderComponent( ) ...\site.php:191
6 0.2543 5828840 JComponentHelper::executeComponent( ) ...\helper.php:380
7 0.2552 5855480 require_once( 'C:\wamp\www\mb219dev\components\com_content\content.php' ) ...\helper.php:405
8 0.2624 6054816 JControllerLegacy->execute( ) ...\content.php:38
9 0.2624 6054952 ContentController->display( ) ...\legacy.php:702
10 0.3610 7169976 JControllerLegacy->display( ) ...\controller.php:113
11 0.3678 7313312 ContentViewArticle->display( ) ...\legacy.php:664
12 0.4494 8561240 JEventDispatcher->trigger( ) ...\view.html.php:161
13 0.4494 8561768 JEvent->update( ) ...\dispatcher.php:159
14 0.4494 8562272 call_user_func_array:{C:\wamp\www\mb219dev\libraries\joomla\event\event.php:69} ( ) ...\event.php:69
15 0.4494 8562536 PlgContentSige->onContentPrepare( ) ...\event.php:69
16 0.4851 8632080 PlgContentSige->createHtmlOutput( ) ...\sige.php:108
17 0.5305 8635904 PlgContentSige->htmlImage( ) ...\sige.php:324
18 0.5305 8636160 PlgContentSige->htmlImageFileInfo( ) ...\sige.php:1353

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