Fatal error: Uncaught ValueError: strrpos(): Argument #3 ($offset) must be contained in argument #1 ($haystack) in /homepages/21/d358286473/htdocs/wp-content/plugins/revslider/includes/functions.class.php:387
Stack trace:
#0 /homepages/21/d358286473/htdocs/wp-content/plugins/revslider/includes/functions.class.php(387): strrpos('', '.', -1)
#1 /homepages/21/d358286473/htdocs/wp-content/plugins/revslider/includes/output.class.php(5554): RevSliderFunctions->check_valid_image('')
#2 /homepages/21/d358286473/htdocs/wp-content/plugins/revslider/includes/output.class.php(1142): RevSliderOutput->get_thumb_url()
#3 /homepages/21/d358286473/htdocs/wp-content/plugins/revslider/includes/output.class.php(1035): RevSliderOutput->add_slide_li_pre(8)
#4 /homepages/21/d358286473/htdocs/wp-content/plugins/revslider/includes/output.class.php(725): RevSliderOutput->get_slides()
#5 /homepages/21/d358286473/htdocs/wp-content/plugins/revslider/includes/output.class.php(642): RevSliderOutput->add_slider_base()
#6 /homepages/21/d358286473/htdocs/wp-content/plugins/revslider/revslider.php(94): RevSliderOutput->add_slider_to_stage('startseite', '', '', '', '')
#7 /homepages/21/d358286473/htdocs/wp-includes/shortcodes.php(343): rev_slider_shortcode(Array, '', 'rev_slider')
#8 [internal function]: do_shortcode_tag(Array)
#9 /homepages/21/d358286473/htdocs/wp-includes/shortcodes.php(218): preg_replace_callback('/\\[(\\[?)(rev_sl...', 'do_shortcode_ta...', '[rev_slider ali...')
#10 /homepages/21/d358286473/htdocs/wp-content/plugins/js_composer/include/templates/shortcodes/rev_slider_vc.php(28): do_shortcode('[rev_slider ali...')
#11 /homepages/21/d358286473/htdocs/wp-content/plugins/js_composer/include/classes/shortcodes/core/class-wpbakeryshortcode.php(271): require('/homepages/21/d...')
#12 /homepages/21/d358286473/htdocs/wp-content/plugins/js_composer/include/classes/shortcodes/core/class-wpbakeryshortcode.php(244): WPBakeryShortCode->loadTemplate(Array, '')
#13 /homepages/21/d358286473/htdocs/wp-content/plugins/js_composer/include/classes/shortcodes/core/class-wpbakeryshortcode.php(366): WPBakeryShortCode->content(Array, '')
#14 /homepages/21/d358286473/htdocs/wp-content/plugins/js_composer/include/helpers/helpers.php(1317): WPBakeryShortCode->output(Array, '')
#15 /homepages/21/d358286473/htdocs/wp-includes/shortcodes.php(343): vc_do_shortcode(Array, '', 'rev_slider_vc')
#16 [internal function]: do_shortcode_tag(Array)
#17 /homepages/21/d358286473/htdocs/wp-includes/shortcodes.php(218): preg_replace_callback('/\\[(\\[?)(rev_sl...', 'do_shortcode_ta...', '[rev_slider_vc ...')
#18 /homepages/21/d358286473/htdocs/wp-content/themes/lambda/inc/options/shortcodes/shortcodes.php(331): do_shortcode('[rev_slider_vc ...')
#19 /homepages/21/d358286473/htdocs/wp-includes/shortcodes.php(343): oxy_section_vc_column(Array, '[rev_slider_vc ...', 'vc_column')
#20 [internal function]: do_shortcode_tag(Array)
#21 /homepages/21/d358286473/htdocs/wp-includes/shortcodes.php(218): preg_replace_callback('/\\[(\\[?)(vc_col...', 'do_shortcode_ta...', '[vc_column widt...')
#22 /homepages/21/d358286473/htdocs/wp-content/themes/lambda/partials/shortcodes/section.php(21): do_shortcode('[vc_column widt...')
#23 /homepages/21/d358286473/htdocs/wp-content/themes/lambda/inc/options/shortcodes/shortcodes.php(90): include('/homepages/21/d...')
#24 /homepages/21/d358286473/htdocs/wp-includes/shortcodes.php(343): oxy_shortcode_section(Array, '[vc_column widt...', 'vc_row')
#25 [internal function]: do_shortcode_tag(Array)
#26 /homepages/21/d358286473/htdocs/wp-includes/shortcodes.php(218): preg_replace_callback('/\\[(\\[?)(vc_row...', 'do_shortcode_ta...', '<p>[vc_row widt...')
#27 /homepages/21/d358286473/htdocs/wp-includes/class-wp-hook.php(287): do_shortcode('<p>[vc_row widt...')
#28 /homepages/21/d358286473/htdocs/wp-includes/plugin.php(212): WP_Hook->apply_filters('<p>[vc_row widt...', Array)
#29 /homepages/21/d358286473/htdocs/wp-includes/post-template.php(253): apply_filters('the_content', '[vc_row width="...')
#30 /homepages/21/d358286473/htdocs/wp-content/themes/lambda/partials/content-page.php(15): the_content('', false)
#31 /homepages/21/d358286473/htdocs/wp-includes/template.php(732): require('/homepages/21/d...')
#32 /homepages/21/d358286473/htdocs/wp-includes/template.php(676): load_template('/homepages/21/d...', false, Array)
#33 /homepages/21/d358286473/htdocs/wp-includes/general-template.php(204): locate_template(Array, true, false, Array)
#34 /homepages/21/d358286473/htdocs/wp-content/themes/lambda/page.php(41): get_template_part('partials/conten...', 'page')
#35 /homepages/21/d358286473/htdocs/wp-includes/template-loader.php(106): include('/homepages/21/d...')
#36 /homepages/21/d358286473/htdocs/wp-blog-header.php(19): require_once('/homepages/21/d...')
#37 /homepages/21/d358286473/htdocs/index.php(17): require('/homepages/21/d...')
#38 {main}
thrown in /homepages/21/d358286473/htdocs/wp-content/plugins/revslider/includes/functions.class.php on line 387