When opening the gateway overview page, there is an "Exception evaluating SpringEL expression"

[gr-hovest-atb]

When opening the page /admin/proxies, there is an internal server error due to a thymeleaf exception:

Message: Exception evaluating SpringEL expression: "proxy.timeOfLastSuccessfulCallToAdmin != null ? #dates.format(new java.util.Date(proxy?.timeOfLastSuccessfulCallToAdmin)) : #{admin.dashboard.gatewayhealthmonitor.notconnectedgateway}" (admin/fragments/proxies/list:146)

Exception | org.thymeleaf.exceptions.TemplateProcessingException

The log says:

2021-08-30 10:41:42.255 ERROR 6332 --- [io-8083-exec-10] org.thymeleaf.TemplateEngine             : [THYMELEAF][http-nio-8083-exec-10] Exception processing template "admin/proxies/list": Exception evaluating SpringEL expression: "proxy.timeOfLastSuccessfulCallToAdmin != null ? #dates.format(new java.util.Date(proxy?.timeOfLastSuccessfulCallToAdmin)) : #{admin.dashboard.gatewayhealthmonitor.notconnectedgateway}" (admin/fragments/proxies/list:146)
2021-08-30 10:41:42.255 DEBUG 6332 --- [io-8083-exec-10] s.s.w.c.SecurityContextPersistenceFilter : SecurityContextHolder now cleared, as request processing completed
2021-08-30 10:41:42.257 ERROR 6332 --- [io-8083-exec-10] o.a.c.c.C.[.[.[/].[dispatcherServlet]    : Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed; nested exception is org.thymeleaf.exceptions.TemplateProcessingException: Exception evaluating SpringEL expression: "proxy.timeOfLastSuccessfulCallToAdmin != null ? #dates.format(new java.util.Date(proxy?.timeOfLastSuccessfulCallToAdmin)) : #{admin.dashboard.gatewayhealthmonitor.notconnectedgateway}" (admin/fragments/proxies/list:146)] with root cause

org.springframework.expression.spel.SpelParseException: Expression [proxy.timeOfLastSuccessfulCallToAdmin != null ? #dates.format(new java.util.Date(proxy?.timeOfLastSuccessfulCallToAdmin)) : #{admin.dashboard.gatewayhealthmonitor.notconnectedgateway}] @125: EL1043E: Unexpected token. Expected 'identifier' but was 'lcurly({)'
	at org.springframework.expression.spel.standard.InternalSpelExpressionParser.raiseInternalException(InternalSpelExpressionParser.java:1005) ~[spring-expression-4.3.13.RELEASE.jar!/:4.3.13.RELEASE]
	at org.springframework.expression.spel.standard.InternalSpelExpressionParser.eatToken(InternalSpelExpressionParser.java:919) ~[spring-expression-4.3.13.RELEASE.jar!/:4.3.13.RELEASE]
[...]